He had a long discussion; they said millions of different things--it's very hard.

调查过程很漫长,他们谈到了成千上万的因素,这活儿不容易

耶鲁公开课 - 金融市场课程节选

And this is so that they could have more possible user IDs not because they have billions and billions of users but surely people create accounts to lead accounts and they don't necessarily have to reuse numbers this way.

这样他们就能有很多的用户ID了,倒不是因为他们有成千上万的用户,而是创建账户来引导其他账户,其实他们完全没有必要以这种方式复用。

哈佛公开课 - 计算机科学课程节选