Bitumogene
沥青成因
🗣️ 情景例句
It's no big deal.
这没有什么。
John is not forty-five yet,is he?
约翰不够45岁,是吗？
As the play draws to its close, they wonder whether they will ever catch that last train home.
当戏快演完时，他们又为是否能赶上末班火车回家而犯愁。