简单流行于黄金时代，狡诈兴盛于冷铁岁月。

Simplicity flourished in the golden age, cunning in these days of iron.

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实务上，这用于辨识化学元素的存在。于冷物体中，它会在这些频率产生吸收谱线。

Which is used actually to identify chemical elements in a cool matter, which is absorbing exactly at those frequencies.

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地幔的运动类似于一壶沸水的运动，它把热的物质带到表面，再把较冷的物质带到深处，从而使地幔冷却。

The mantle's motions, analogous to those in a pot of boiling water, cool the mantle by carrying hot material to the surface and returning cooler material to the depths.

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I'm hot, compared to the air of the room, or cold if I'm somewhere that's warm.

我相对于室内的空气是热的，或是冷的如果我呆在一个温暖的地方。

麻省理工公开课 - 热力学与动力学课程节选