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adj. 无效的，无价值的；等于零的
n. 零，[数] 空
adj.
零值的；等于零的；（协议） 无法律效力；失效的
英英释义
null[ nʌl ]
n.a quantity of no importance
同义词：nothingnilnixnadaaughtciphercyphergoose eggnaughtzerozilchzipzippo
adj.lacking any legal or binding force
"null and void"
同义词：void
词组短语
null and void无效的
null hypothesis零假设；虚假设；解消假设
null space零空间
null value空值
null pointer空指针
null string空行；空串
双语例句
用作形容词(adj.)
Their actions rendered the contract null and void.
他们的行为使合同无效。
The marriage was declared null and void.
婚姻已宣告无效了。
用作名词(n.)
The path must end with a null character.
该路经必须以零结尾。
Vomit in null gravity wouldn't be fun.
如果在零重力下呕吐了可不是件好笑的事。
A null reference pointer was passed to the stub.
向占位程序传送了空的索引指针。
Primary keys do not allow null values.
主键不允许空值。
权威例句
Null Hypothesis Testing: Problems, Prevalence, and an AlternativeMicrosatellite null alleles and estimation of population differentiation.
Estrogen receptor null mice: what have we learned and where will they lead us?
The file drawer problem and tolerance for null results.
Mice carrying null mutations of the genes encoding insulin-like growth factor I (Igf-1) and type 1 IGF receptor (Igf1r).
Inference When a Nuisance Parameter Is Not Identified Under the Null Hypothesis
Transforming growth factor beta 1 null mutation in mice causes excessive inflammatory response and early death.
Erratum: Estrogen receptor null mice: What have we learned and where will they lead us? (Endocrine Reviews (June 1999))
Testing the null hypothesis of stationarity against the alternative of a unit root ☆ : How sure are we that economic time series ha...
Molecular heterogeneity of complement component C4-null and 21-hydroxylase genes in systemic lupus erythematosus
null (adj.)
"void of legal force," 1560s, from Middle French nul, from Latin nullus "not any, none," from ne- "not, no" (see un-) + illus "any," diminutive of unus "one" (see one).
1. Therefore, it is null.
因此，它是空的。
www.ibm.com
2. Accessing the null pointer is very dangerous, as it might crash your program.
访问空指针是非常危险的，因为它可能使您的程序崩溃。
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3. But while the price of gold has almost doubled in the past four years, his investment may be null.
然而，虽然在过去四年里金价几乎翻了一番，但他这笔投资带来的回报却可能是零。
cn.wsj.com
4. For more discussion on this issue, see my article The Null Flag bug pattern.
关于这个问题的更多讨论，请参阅我的文章 空标志错误模式。
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5. If the XML parser sees a null character in its input, it throws an exception and stops processing.
如果XML解析器在其输入中看到一个空字符，它就会发出异常并停止处理。
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6. This method will return null if the focus owner is not in the same context as the calling thread.
如果该焦点所有者未和调用线程处于同一个上下文中，那么该方法会返回空。
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7. The null style sheet uses all default template rules, with the effect of stripping all markup from any XML file.
这个空样式表使用了所有缺省模板规则，其作用是将所有标记从XML文件中剥离。
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8. A null modem cable is a serial cable that allows data to be sent between two serial ports.
零调制解调器电缆是一种允许在两个串行端口之间发送数据的串行电缆。
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9. This expression also removes all null characters and excess whitespace.
此表达式也会删除所有空字符和过量的空白。
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10. Delete any data older than this time. NULL or the duration these results should be kept.
删除任何早于这个时间的数据空值，或指定保留结果的期限。
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11. Each of these methods will return null if its opposite component or window is in a different context.
如果其对立组件或窗口处于一个不同的上下文，这些方法中每一个都会返回空。
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12. This null finding should not be a surprise given that the transformation of the original poll results was just to add a constant of 100 to each previous poll outcome.
考虑到最初民意测验结果的转换只是通过向前面每个民意测验结果添加常数100 完成的，那么这种零发现也不应当有什么令人吃惊的地方了。
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13. Supports, primary, foreign, unique, not null and check constraints.
支持主键、外键、惟一、非空和检查约束。
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14. For each document in the database that has name and amount fields with non-null values, a result row is created in the view.
对于数据库中包含具有非空值的名称和金额字段的每个文档来说，将在视图中创建一个结果行。
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15. You can also test with a null parameter to see what happens.
您也可以使用一个空值参数来测试，看结果是什么。
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16. A null return value implies all active slices, while an empty array will raise an exception.
空返回值意味着所有片都是活动的，而空数组则会引发一个异常。
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17. Before using objects like rows and cells, be sure to test them to make sure they are not null.
在使用行和单元格这样的对象之前，一定要测试它们，确保它们不为空。
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18. This article discusses the 25-pin null modem cabling.
本文讨论了25针零调制解调器电缆。
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19. If no match is found in step 9, return null to the user/user application.
如果在第 9步中没有发现匹配，那就向用户/用户应用程序返回空值。
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20. It must be non-null.
它必须是非空的。
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21. Otherwise you must retain the null hypothesis.
否则您就必须使用该无效假设。
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22. It is very important that you have the correct null modem cable with you to set up the debugging environment.
为了设置调试环境，拥有正确的零调制解调器电缆是非常重要的。
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23. These instance variables are not reset and, if they are not null, are used to provide the username and password on every request.
这些实例变量不能重新设置，如果它们不为空，则用于为每个请求提供用户名和密码。
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24. If this checkbox is not selected, the generated WSDL is set to "" (null), as shown in Listing 7.
如果这个复选框没有选择，那么产生的WSDL 的设置为“”（空的），如列表7所示。
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25. If this checkbox is not selected, the generated WSDL is set to "" (null), as shown in Listing 7.
如果这个复选框没有选择，那么产生的WSDL 的设置为“”（空的），如列表7所示。
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26. This check is null and void.
本支票无效。
-- 来源 -- 英汉 - 辞典例句
27. The court ruled that the claim was null and void.
法庭裁决此项要求无效。
-- 来源 -- 英汉 - 辞典例句
28. The operator O is the null operator.
算符O是零算符。
-- 来源 -- 英汉 - 辞典例句
29. This contract is null and void.
此合同无效.
-- 来源 -- 英汉 - 辞典例句
30. The null subset corresponds to the term 1.
空集则对应于常数项1。
-- 来源 -- 英汉 - 辞典例句
31. Range: 0 = high priority, 1 = middle priority, 2 = lowest priority (or NULL) [Optional]
范围： 0 = 高优先级 1 = 中优先级 2 = 低优先级（或 null）[可选的]
-- 来源 -- science - 汉英
32. Range: a = amps, t = tdma, at = amps/tdma (or NULL) [Optional]
范围： a = amps，t = tdma，at = amps/tdma（或 null）[可选的]
-- 来源 -- science - 汉英
33. Range: -127 - 127 (or NULL) [Optional]
范围： -127 - 127 （或 null） [可选的]
-- 来源 -- science - 汉英
34. Range: 0 - 15 (or NULL) [Optional]
范围： 0 - 15 （或 null） [可选的]
-- 来源 -- science - 汉英
35. A promise obtained by force is legally null.
一个以武力获得的契约在法律上是无效的。
-- 来源 -- 英汉 - 辞典例句
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