Ballvalves
(ballvalve 的复数) 球型人造瓣膜
🗣️ 情景例句
And you didn't have a chance to eat.
而且你什么也没有吃。
The spoon is dirty, Would you bring me a clean one, please?
这汤勺是脏的，请你拿个干净的给我。
A page from a student's diary
学生日记一则