但当两个“囚徒”一次又一次地玩，从中相互学习——也即“重复的[5]囚徒困境”——游戏的推演就发生了变化。

But when two "prisoners" played the game over and over, learning from each other-a game known as the Iterated prisoner Dilemma-the dynamics of the game shifted.

youdao

在试验中，他们构建了一个DNA版本的“异或”逻辑门，当两个输入端中有一个有输入时，产生输出；但当两个输入端都有或都没有输入时，就不会产生输出。

In tests, they modeled a DNA version of an XOR logic gate that generates an output when one of two inputs is present, but not when both or neither is present.

youdao

但当扩音器播放南楼安全的通告后，他们两个分别返回了办公室。

But when the announcement came over the loudspeaker that the tower was safe, they both went back to work.

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