Understudying
v. 练习做临时演员( understudy的现在分词 )
🗣️ 情景例句
You might want to read up a little on the culture before you get there.
去那儿之前，你应该读一些关于那边文化方面的书。
This is a chair.
这是一张椅子。
(A light year is the distance which light travels at 186,000 miles per second in one year,
一光年是光以每秒186，000英里的速度在一年内走的距离，