Tachometry
n. [测]转速测定(法),流速测定(法)
🗣️ 情景例句
I have good news and bad news, which do you want to hear first?
我有好消息和坏消息，你想先听哪个？
A watched pot is long in boiling.
心急水不沸。
Do you still have the cock year stamp?
你还有鸡年的邮票吗？