R

英式音标：[ɑ:(r)]

美式音标：[ɑr]

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概况：

n. 英语字母中的第十八个字母

abbr. 电阻（resistance）；比率（ratio）；医生处方（recipe）

词义：

n.

英语字母表的第18个字母；

英英释义

R[ ɑ: ]

n.

a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air

同义词：roentgen

(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole

同义词：gas constantuniversal gas constant

the 18th letter of the Roman alphabet

同义词：letter r

the length of a line segment between the center and circumference of a circle or sphere

同义词：radius

用法：

词组短语

r and d abbr. 研究发展（Research and Development）

r wave非线性波

双语例句

The trilled `r' is produced by vibrating the tongue against the upper teeth.
发带颤音的r，舌抬向上齿颤动而成。

权威例句

Covering system

Cancer statistics, 2010.

Protein Measurement With Folin Fenol Reagent

W.R. Grace & Co. v. EPA: An Arbitrary Outcome

Protein measurement with the Folin phenol reagent.

System and method for providing even heat distribution and cooling return pads

Epidémiologie de la luxation congénitale de hanche dans la région Languedoc-Roussillon

AR-GE HARCAMALARI VE İLERİ TEKNOLOJİ MAL İHRACATI İLİŞKİSİ: PANEL NEDENSELLİK ANALİZİ THE RELATIONSHIP BETWEEN R&D EXPEN...

Psychological Methods of Healing. By William Brown, D.M., D.Sc, F.R.C.P. (London, University of Lon...

The Romance of Treasure Trove. By Charles R. Beard (with an introduction and one chapter by Ronald A. Co...

英语词源：

R

In a circle, meaning "registered (trademark)," first incorporated in U.S. statues 1946. R&R "rest and relaxation," first recorded 1953, American English; R&B "rhythm and blues" (type of popular music) first attested 1949, American English.

If all our r's that are written are pronounced, the sound is more common than any other in English utterance (over seven per cent.); the instances of occurrence before a vowel, and so of universal pronunciation, are only half as frequent. There are localities where the normal vibration of the tip of the tongue is replaced by one of the uvula, making a guttural trill, which is still more entitled to the name of "dog's letter" than is the ordinary r; such are considerable parts of France and Germany; the sound appears to occur only sporadically in English pronunciation. [Century Dictionary]

---

The moment we encounter the added r's of purp or dorg in our reading we know that we have to do with humor, and so with school-marm. The added consonants are supposed to be spoken, if the words are uttered, but, as a matter of fact, they are less often uttered than seen. The words are, indeed, largely visual forms; the humor is chiefly for the eye. [Louise Pound, "The Humorous 'R,'" "American Mercury," October 1924]

She goes on to note that in British humorous writing, -ar "popularly indicates the sound of the vowel in father" and formations like larf (for laugh) "are to be read with the broad vowel but no uttered r." She also quotes Henry James on the characteristic prominence of the medial -r- sound (which tends to be dropped in England and New England) in the speech of the U.S. Midwest, "under some strange impulse received toward consonantal recovery of balance, making it present even in words from which it is absent, bringing it in everywhere as with the small vulgar effect of a sort of morose grinding of the back teeth."

造句：

1. The beam bends to a circular profile of radius R.

梁弯曲成半径为r的园形形状。

-- 来源 -- 英汉 - 辞典例句

2. It is clear that for any graph G the space R(G) and R(TG) are homeomorphic.

显然，对任意一个图G，空间r（G）和空间r（TG）是同胚的。

-- 来源 -- 英汉 - 辞典例句

3. R must be partitioned for each individul component.

对各个组成部分的r必须加以区分。

-- 来源 -- 英汉 - 辞典例句

4. There was no reference to anything named The R Document.

没有发现对所谓的代号r密件有参考价值的东西。

-- 来源 -- 英汉 - 辞典例句

5. The circumference of the circle is 2πr and the time for one revolution is 2πr/v.

圆的周长是2πr，转一圈的时间是2πr／v。

-- 来源 -- 英汉 - 辞典例句

6. The coefficient of correlation, R, is obtained by taking the square root of R2.

相关系数r是通过把r2开平方根求得的。

-- 来源 -- 英汉 - 辞典例句

7. It was a periodical commenced by R. Dodsley in 1758.

它是一种期刊，由r?多兹利在1758年创刊。

-- 来源 -- 英汉 - 辞典例句

8. R (L) is the amplitude of the transmitted light.

r（L）是透射光振幅。

-- 来源 -- 英汉 - 辞典例句

9. Now consider the appearance of the trial function at intermediate values if R.

现在考虑r在中等数值时，尝试函数的表现。

-- 来源 -- 英汉 - 辞典例句

10. The external forces include reactions (R)as well as applied loads(P).

外力包括反力r和施加力荷载P。

-- 来源 -- 英汉 - 辞典例句