Unfrequent
a. 不常发生的,不常见的
✅ 同义词
🗣️ 情景例句
from his new book entitled Family Album, U.S.A.
从他的新书Family Album, U.S.A.
Be my guest.
请便、别客气
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。