十进制小数中的点，表示从该点开始，值就从10的正次幂变成10的负次幂。
A dot written in a decimal number to indicate where the place values change from positive to negative powers of 10.
十进制小数中的点，表示从该点开始，值就从0的正次幂变成0的负次幂。
A dot written in a decimal number to indicate where the place values change from positive to negative powers of 0.
十进制系统的基数为10，且从小数点每左进一位或者右退一位，其权增加或者减少10的幂次。
In the decimal system the base or radix is 10, and each position to the left or right of decimal point presents an increased or decreased weight as power of 10.
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