Perf.
abbr. 穿孔（perforate）
🗣️ 情景例句
This weekend I'm going to install a home security system.
这个周末我要装一套家庭保安系统。
Carrion crows bewail the dead sheep and then eat them.
乌鸦吃死羊，先要哭一场；猫哭老鼠假慈悲。
The airport was built years ago, but for some reason it could not be used then.
机场是许多年前建的，但由于某种原因当时未能启用。