21用英语怎么说的
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"21" is the number 21 in English. It is a cardinal number that represents the quantity of 21 items, such as "There are 21 days in a month."
The number 21 is derived from the base-10 number system, which is a decimal system used by most cultures around the world. In this system, the numbers 0 through 9 are used to represent the digits in a number, and the position of each digit determines its value. For example, in the number 21, the 2 is in the tens place and represents 2 tens, or 20, and the 1 is in the ones place and represents 1 one, or 1.
Here are some example sentences using the number 21 in English:
"I'll be 21 years old next month." (我下个月就21岁了。)
"He won $21 in the lottery." (他在彩票中赢了21美元。)
"The flight leaves at 21:00." (飞机在21:00起飞。)
The number 21 is derived from the base-10 number system, which is a decimal system used by most cultures around the world. In this system, the numbers 0 through 9 are used to represent the digits in a number, and the position of each digit determines its value. For example, in the number 21, the 2 is in the tens place and represents 2 tens, or 20, and the 1 is in the ones place and represents 1 one, or 1.
Here are some example sentences using the number 21 in English:
"I'll be 21 years old next month." (我下个月就21岁了。)
"He won $21 in the lottery." (他在彩票中赢了21美元。)
"The flight leaves at 21:00." (飞机在21:00起飞。)
21用英语怎么说的
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