Hydropteridine
氢化蝶啶
🗣️ 情景例句
What's the matter?
发生了什么事？
To notice the table
注意到桌子
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。