Before last week's announcement, the total number of so-called exoplanets outside our solar system was just over five hundred.

VOA: special.2011.02.09

I have shown that by taking Avogadro's number of individual ion pairs and putting them all together in a line, the system's energy became more negative.

我推导出了,从每一个离子对中抽出阿伏加德罗常数,再把它们放在一起在一列中，这个系统的能量就变得更负。

麻省理工公开课 - 固态化学导论课程节选

It's a closed system, so the number moles doesn't change.

这是一个封闭系统，因此摩尔量不会改变。

麻省理工公开课 - 热力学与动力学课程节选

The U.S. Department of Defense expects in coming weeks to grant two separate security approvals for Samsung's Galaxy smartphones, along with iPhones and iPads running Apple's latest operating system moves that would boost the number of U.S. government agencies allowed to use those devices.

WSJ: Pentagon Expects to Enlist Apple, Samsung Devices

One criticism of the system is Italy's high number of lawyers.

NPR: Knox Case Puts Italian Justice Under Scrutiny

There is, in essence, no data other than the categories and the random number stored in the system and so it's impossible to know (or indeed reverse engineer from that) who you are or where you've been.

BBC: Phorm: Your questions answered