Trav
abbr. 末端控制的变风量系统（Terminal Regulated Air Volume）
🗣️ 情景例句
There is an emergency. Please send a fire engine.
这有火灾，请尽快派消防车来。
Clearly their victory is out of the question.
很显然，他们是不可能获胜的。
What is it? asked the man.
“什么事？”楼上人问。