Density bullet
[计] 密度针
🧩 词语组成解析
🗣️ 情景例句
You're kidding!
在开玩笑！
My raincoat is purple.
我的雨衣是紫色的。
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。