当这些原理应用到飞机上时，它们并没有本质上的不同。

When applied to aircraft, the principles are not substantially different.

youdao

机械时钟的出现意味着，尽管它可以通过调整来记录日光时，但是它本质上适合记录相等的时间。

The advent of the mechanical clock meant that although it could be adjusted to maintain temporal hours, it was naturally suited to keeping equal ones.

youdao

我们要讨论的是,在我们思考死亡本质时产生的哲学问题。

Well, the things we'll talk about are philosophical questions that arise as we begin to think about the nature of death.

youdao

And all this is, is saying that when you take a mixed second derivative, it doesn't matter in which order you take the two derivatives.

麦克斯韦关系的本质是,当你考虑混合的二阶导数时，求导的顺序不影响最后的结果,现在，我们利用这些关系。

麻省理工公开课 - 热力学与动力学课程节选

Well, the things we'll talk about are philosophical questions that arise as we begin to think about the nature of death.

我们要讨论的是,在我们思考死亡本质时产生的哲学问题。

耶鲁公开课 - 死亡课程节选

This should make sense because if something has a low ionization energy, that means it's not very electronegative, which means it's going to be a lot happier giving up electron density, which is essentially what you're doing -- when you're forming covalent bonds is you're sharing some of your electron density.

这应该是合理的,因为如果某物的电离能很低，这也就意味着它的电负性也不高，那么它就会更愿意,放弃一定的电子密度，而本质上这正是你在,形成共价键时所需要做的,分享你的一些电子密度。

麻省理工公开课 - 化学原理课程节选