两能级原子置于噪声场中，噪声场用热库态描述。

A two-level atom is put in noise field, which is described as thermal reservoir.

youdao

用多模相干态描述光场，应用预解算符和投影算符推导演化算符，使本方法可统一处理锁模激光脉冲序列输出及原子的共振多光子过程。

This method can be used to describe the resonant multi-photon processes that the pulse train from the mode locked laser interacting with atoms.

youdao

现在我们要展示一种记号，来标记我们如何，从这里描述的，这样的一个平衡态过渡到另一个平衡态？

Now we want to show a notation, how do we go from one equilibrium state like this describes to another equilibrium state?

youdao

So, these on-changing properties that describe the state of the equilibrium state of the system are called state variables.

这些描述,系统平衡态的,变化的属性,就叫做状态变量。

麻省理工公开课 - 热力学与动力学课程节选

OK, so now let's try to formulate how to describe the equilibrium state and what dictates spontaneity.

现在我们尝试,找出如何描述平衡态以及,什么东西表明自发性。

麻省理工公开课 - 热力学与动力学课程节选

And resonance is the idea that sometimes one single Lewis structure does not adequately describe the electron configuration around a given molecule, so instead you need to draw two different Lewis structures to describe that more appropriately.

而所谓共振态,就是有时候一个路易斯结构不足以,完整描述一个给定分子的电子排布，因此这时你需要同时画出两个,不同的路易斯结构来描述它,这样会更恰当。

麻省理工公开课 - 化学原理课程节选