A1
a. 第一等的
🗣️ 情景例句
Just try to be patient.
尽量耐心一点。
No, it isn't. Yes, it is.
不，它不是。 是的，它是。
This would solve the problem of ventilation, for if a train entered this tunnel, it would draw in fresh air behind it.
因为如果有列火车开进隧道，它就把新鲜空气随之抽进了隧道。