如果你不用一个点，而只是放一个数字，这指定了你插入的数字所使用的空间宽度。
If you don't put a point but just put a number, this specifies the width of space that will be used by the number you're inserting there.
如果你不用一个点，而只是放一个数字，这指定了你插入的数字所使用的空间宽度。
If you don't put a point but just put a number, this specifies the width of space that will be used by the number you're inserting there.
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