Perf
n. 穿孔
🗣️ 情景例句
You don't need to do that, Grandpa.
你不用这样，爷爷。
How much is it by air mail?
航空信要多少钱？
Eventually chains were fixed to one end of the dish and a powerful winch was put into operation.
不过，他们终于将链条固定在盘子的一端，一台大功率的绞车开动起来。