Trav
abbr. 末端控制的变风量系统（Terminal Regulated Air Volume）
🗣️ 情景例句
I can't figure out why she said so.
我不能理解她为什么这样说。
The greatest fool is he who worries about what he cannot help.
操心无法可想的事是最大的傻瓜。
There is no sky in June so blue that it does not point forward to a bluer,
六月蔚蓝的天空总使人遥想一个更加蔚蓝的苍穹；