You start with the square of an electron's charge, divide it by the speed of light and Planck's constant, then multiply the whole lot by two PI.

一开始将电子电荷平方，再除以光速和普朗克常数，然后将总数乘以2个圆周率。

youdao

Indexes: 1 PI REPLY_CONTEXT (5) : optional, used if the process has a two-way interface.

索引数量：1 pi REPLY_CONTEXT(5)：可选，只在流程使用双向接口的情况下使用。

youdao

The angle actually goes from minus pi over two to pi over two.

实际上，角度取值范围是从-π/2到π

youdao

So, what we end up having is three of these pi -- 2 p y 2 p y bonds, we can have one between these two carbons here.

我们剩下的有三个π键-,2py2py键，在这两个碳原子之间会有一个。

麻省理工公开课 - 化学原理课程节选

The two-month long competition was run by the foundation behind the Raspberry Pi and intended to find the best young programmers working with the bare-bones computer.

BBC: Time-lapse code wins Raspberry Pi contest

Ang Lee's 3D epic Life of Pi - which went into the awards with nine nominations - picked up two awards for cinematography and special visual effects.

BBC: Baftas: Argo wins best film award

After two years of building and tweaking, the folks at Party Robotics have finally polished their Raspberry Pi-powered cocktail-making rig and have posted it to Kickstarter.

ENGADGET