Filicopsida
蕨纲; 蕨纲
🗣️ 情景例句
Don't tell any one,
别告诉别人，
I'd like to ask you just one question.
恕我请教你一个问题。
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。