As we mentioned in one of the earlier classes, these macronutrients differ in how much energy you can derive from them.

我在之前一节课提过,身体从不同大量营养素中吸收的能量不同

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

It's called this just because it's an electron that results when an electron absorbs a photon's worth of energy, so thus it's a photoelectron.

之所以这样称呼是因为,当一个电子吸收,一个光子的能量的结果，因此它是一个光电子。

麻省理工公开课 - 化学原理课程节选

So it's the amount of energy, usable energy for the body that a food provides.

所以卡路里是能量的总额,食物所提供的被人体吸收的能量

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Absorption is just the opposite of emission, so instead of starting at a high energy level and dropping down, when we absorb light we start low and we absorb energy to bring ourselves up to an n final that's higher.

吸收就是发射的逆过程,与从一个高能量到低能量不同，当吸收光时，我们从低能量开始,吸收能量到一个更高的能量。

麻省理工公开课 - 化学原理课程节选

So that's the important take-away message from this slide. If we think about these different types of lights, microwave light, if it's absorbed by a molecule, is a sufficient amount of frequency and energy to get those molecules to rotate. That, of course, generates heat, so that's how your microwaves work.

重要的信息，如果我们看看,这些不同种类的光，微波,如果被分子吸收，它的频率和能量可以,使分子转动,这当然的，会产生热量,这就是你们微波炉的工作原理。

麻省理工公开课 - 化学原理课程节选