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

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？

youdao

They are small enough to easily slip inside your house, live in colonies that number in the tens of thousands to the hundreds of thousands, and reproduce quickly.

它们很小，可以轻易地溜进你的房子里，成群地生活，数量从几万到几十万，迅速繁殖。

youdao

The secret number is my phone number in reverse.

这个密码是我的电话号码的逆序排列。

《牛津词典》

They found the number in the United States rose almost forty-two percent since nineteen ninety.

VOA: special.2010.04.14

this is now a chart of just a component number five, 787 the lattice energies. Keep this number in mind, 787.

这是成分5的图表，晶格能，记住这个数。

麻省理工公开课 - 固态化学导论课程节选

I'm guessing the average number in the class now is probably about 3 or 4, maybe even lower.

我猜这次的平均数字大约在3或者4,甚至可能更低

耶鲁公开课 - 博弈论课程节选

It is also home to around 16, 000 bird species, double the number in all Europe.

BBC: Hot springs and hummingbirds in Ecuador

The Police Service of Northern Ireland introduced a single non-emergency number in 2005 - 0845 600 8000.

BBC: Non-urgent police calls 'go unanswered'

Tiger families and easygoing families ranked second, with about the same number in each category.

FORBES: Tiger Moms Don't Raise Superior Kids, Says New Study