Luffing
俯仰运动, 上下摆动, 起重机臂的转动
🗣️ 情景例句
You must have the wrong number.
你一定打错电话了。
The used key is always bright.
常用的钥匙总是光亮的。
I met Zheng Jie after one of his concerts about a week ago.
大约一周前，我在郑杰的一场音乐会之后见过他。