Quadron
季环素
🗣️ 情景例句
at the Museum of Natural History.
在自然历史博物馆。
I'm going to use three pounds.
我要用三磅。
The cave might never have been discovered has not the entrance been spotted by the distinguished French pot-holer, Berger.
若不是法国著名洞穴探险家伯杰由于偶然的机会发现了这个洞口的话，这个洞也许不会为人所知。