Peristomium
围口节(环节动物)
🗣️ 情景例句
We should have done it sooner.
我们早就该取下来的。
Everything is going according to schedule.
一切在按照预定计划进行。
They were still neck and neck! But the other runners were not far behind.
他们仍在肩并肩地跑！但是，其他运动员也距离他们不远。