Underexpansion
(喷管中气体)不完全膨胀, 膨胀不足
🗣️ 情景例句
I've seen a lot of people wearing runners lately. I guess they're back in fashion.
最近我看到很多人穿上了披肩，我看是不是披肩又流行起来了？
Reading is to the mind what exercise is to the body.
读书养神，锻链健身。
I don't think much of the movie.
我认为那电影不怎么样。