Probalility density
[电] 机率密度
🧩 词语组成解析
🗣️ 情景例句
I'm tired and hungry.
我累了， 也饿了。
Can I use the lift?
我能用电梯吗？
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。