Ballvalve
球型人造瓣膜
🗣️ 情景例句
I think I've caught a cold.
我觉得我感冒了。
We have no vacancies now, but we'll certainly bear your application in mind.
我们目前没有空缺，但是我们一定记住你申请的事。
it can become a 'flying fruit-bowl', carrying bananas from the plantations to the ports;
它能成为飞行水果盘子，把香蕉从种植园运到港口。