由于它化学性质极端活泼，所以几乎不把它作为金属使用(除了做化学反应剂)。

It is a soft, silvery white metal, not found free in nature and rarely used as the metal (except as a chemical reagent) because of its extreme reactivity.

youdao

原来，这个世界上，对某个事件能产生化学反应的，除了非做不可的坚决，还有，时间。

Originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, and time.

youdao

在有化学反应的情形下，应根据化学反应速度与湍流交换速度的相对大小对K理论做修正；

Otherwise, the K theory should be modified according to the relative speed of reactions and turbulence .

youdao

Another experiment would be to mix two chemicals together and put a thermometer in and measure the temperature.

比方说做这样一个试验,将两种化学试剂混合然后测定反应温度

耶鲁公开课 - 金融市场课程节选

What I am going to do next day is go into the larger stoichiometry and understand the principles of mass balance and reactivity But before you go,hold it,I don't want you racing off.

下堂课我要做的是,讨论化学计量学，和,质量平衡很反应定律,但在下课之前，我不希望你们这么快走。

麻省理工公开课 - 固态化学导论课程节选

Anybody have an idea? What's the one function of state? I'm the system, the rest are the surrounding. What's the one function of state that's constant when I'm doing all my chemical reactions to move my arms around?

态函数又是什么呢？,我是一个系统，其余的是周围的环境,那么当我在做所有的化学反应,去四处移动我的手臂的时候,什么量是常数？

麻省理工公开课 - 热力学与动力学课程节选