It is useful for status flags and for other things that don't change during the life of a process, like pi, for example, or all the countries in Africa.

它用于状态标志和进程生命周期中不发生更改的其他东西，比如 pi 或非洲的所有国家。

youdao

I escorted my head, it feels like "Pi Pilu and live vehicle" as head of the Toto suddenly become larger, and become heavier.

我扶着我的头，感觉它就像《皮皮鲁和活车》中的托托那样头突然就变大了，变重了。

youdao

There's not two bonds, that's one pi bond, and the reason is because it's 2 p orbitals coming together, and remember p orbitals have electron density above and below the axis, so when they come together, it kind of looks like one bonds, but essentially what we have here is one pi bond.

这不是两个键，这是一个π键，因为这是两个2p轨道组合而成的，记住p轨道在键轴之上,和键轴之下都有电子密度，当它们靠近时，这看着很像两个键，但本质上它是一个π键。

麻省理工公开课 - 化学原理课程节选

Tau, like pi, has infinitely many digits arranged in an apparently random order, so it's impossible to use them all.

CNN: STORY HIGHLIGHTS

Like Life of Pi, Cloud Atlas was based on a book that many considered to be unfilmable because it dealt more with ideas than it did with action.

FORBES: Why I Hope 'Life of Pi' Will Succeed At The Box Office (Even Though I Know It Won't)