Flats
n. 平原, 扁钢；低沼泽（flat的复数形式）
🗣️ 情景例句
How come you speak such good English?
你为什么能说这么好的英语呢？
I'm always punctual.
我总是很准时。
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。