Preenvelop
预包络
🗣️ 情景例句
We'll talk about it out there.
我们到外头谈。
Long absent, soon forgotten.
长久不在的人，很快被忘怀。
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。