Mitchellite
镁铬铁矿
🗣️ 情景例句
Thanks, Richard.
谢谢你 Richard。
Have a nice Thanksgiving!
感恩节快乐！
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。