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
He came down with the flu, so he didn't go to work.
他感冒了，所以没去上班。
John and I are old friends.
我和约翰是老朋友了。
Here you are.
给你。