Ballvalves
(ballvalve 的复数) 球型人造瓣膜
🗣️ 情景例句
Go ahead, Philip.
去吧 Philip。
How did he get away with cheating?
他是如何考试做弊而未被发现？
and even so, some starting data has to guessed,
既使是这样，有些开始时的资料也不得不依靠推测，