Well, you could put a baby down, have a picture of a dog here, a picture of a cat here, and see which one the baby looks at.

你可以抱来一个婴儿,在这里呈现一张狗的照片,在这里呈现一张猫的照片,然后观察婴儿会看哪一张照片

耶鲁公开课 - 心理学导论课程节选

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