Ballvalves
(ballvalve 的復(fù)數(shù)) 球型人造瓣膜
??? 情景例句
I'll get you to help serve later.
等一會我會叫你幫忙分菜。
One should eat to live, not live to eat.
人為生而食，非為食而生。
The river which forms the eastern boundary of our farm has always played an important part in our lives.
形成我們農(nóng)場東部邊界的一條河流一直在我們生活中發(fā)揮著重要作用。