Tach
abbr. 环节（tache）；转速计（tachometer）
🗣️ 情景例句
He is quick-witted.
他反应灵敏。
We used to have a lot of fun when we were that age.
当我们是变老时，我们过去常有很多趣事。
Obviously she's gone somewhere to stay.
很明显她去别的什么地方，呆在那儿了。