Dipropylurea
二丙脲
🗣️ 情景例句
Let's do it!
我们来录！
Touch pitch and you will be defiled.
近朱者赤，近墨者黑。
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。