Annulus
n. 環(huán), 環(huán)形物, 體環(huán)\\n[化] 環(huán)形縫; 環(huán)隙
?? 醫(yī)學(xué)釋義
環(huán)形物，環(huán)形套管
??? 情景例句
Oh, it's beautiful, Rita Mae!
噢 ，太漂亮了， Rita Mae！
I think it's going to take too much time.
我認(rèn)為它將花太多時(shí)間。
What's it used for?
有什么用途？