Perf.
abbr. 穿孔（perforate）
🗣️ 情景例句
When's the next class?
下一次上课什么时候？
How much does a round trip ticket to go there cost?
一张去那边的往返票要多少钱？
Now, this is the chemistry lab. Have you been in this lab before?
好啦，这是化学实验室。你们以前到过这个实验室吗？