在中国，我们能从手机号码的第四位数到第七位数知道些什么？

What can we know from the fourth to the seventh digits of a mobile phone number in China?

youdao

美国、澳大利亚和印度等国家使用10位数的电话号码。

Countries like the United States, Australia and India use phone numbers with 10 digits.

youdao

数周之内，就会有个身份号码。

Within a few weeks he will have an identity number.

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