吨位、长度规格以整数位单位。
Specification for tonnage and length should take integer as unit.
这个值必须小于或等于整数位数。
n —用于整数位，以告知格式化程序将此Number对象转变成一个数字。
n — is used for numbers, and denotes to the formatter to turn this Number object into a number.
写一个名叫rotate _ word的函数，接收一个字符串和一个整形为参数，返回将源字符串移位该整数位得到的新字符串。
Write a function called rotate_word that takes a string and an integer as parameters, and returns a new string that contains the letters from the original string rotated by the given amount.
不过，为了进行计算，我们需要将这些数位视为整数。
However, to make calculations, we need to treat the digits as integers.
pai也是个无理数，它的小数位有无限多，而且pai无法写成了两个整数的比值。
It's also an irrational number, with an infinite number of decimal places and can't be written as a ratio of two whole Numbers.
将数字四舍五入到指定的小数位数，或如果未指定小数位数，则四舍五入为整数。
Rounds a number to a specified number of decimal places or to a whole number if no decimal places are specified.
所有的国家都使用相同的字符来分隔小数部分和整数部分，或对数位进行分组。
All countries do not use the same characters for separating the decimal part from the integer part, and for grouping digits.
我们已经知道：计算整数加法时，要相同数位对齐，从个位加起。
We know that when doing additions of whole numbers, we should line up the numbers at the same place. Add from the ones place first.
我们已经知道：计算整数加法时，要相同数位对齐，从个位加起。
We know that when doing additions of whole numbers, we should line up the numbers at the same place. Add from the ones place first.
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