Annulus
n. 环, 环形物, 体环\\n[化] 环形缝; 环隙
🏥 医学释义
环形物，环形套管
🗣️ 情景例句
It's a beautiful day.
今天天气真好。
Better pills may have wholesome effects.
良药苦口。
The movie was pretty good.
那部电影非常好