Umsuff
水羊毛草
🗣️ 情景例句
He was very kind.
对人和蔼。
He is supposed to be there on time.
按理说他应该准时到那儿。
It must have been a gas that could burn but that would not explode, a gas that did not smell strong, and a gas that did not kill people.
它一定是一种能够燃烧而不能爆炸的气体，一种味道不很强的而且不使人致死的气体。