Propanal
丙醛
🗣️ 情景例句
We've got permission to go inside the old building
我们已获 进入那栋老建筑物
So soon? Why don't you stay a little longer?
这么早就走了？为什么不呆一会呢？
It was stolen twenty years ago when Dan was a boy of fifteen!
这是20年前丹还是一个15岁的孩子时被人偷走的！