Ballvalves
(ballvalve 的复数) 球型人造瓣膜
🗣️ 情景例句
Can't you figure it out?
找不到答案吗？
Oh, really? I'm moving there too.
真的？我也会搬到那儿去。
She heard the front door open and heavy footsteps in the hall.
她听见前门被打开，走廊里响起重重的脚步声。