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
Financial security, that's what it's all about.
家庭财政状况无忧，这就够了。
As soon as you have drunk, you turn your back upon the spring.
忘恩负义。
Are you looking forward to your holiday?
你在盼着你的假期吗？