Ballvalve
球型人造瓣膜
🗣️ 情景例句
But you may rest assured that the payment is guaranteed.
但是你尽可以放心，我们的付款是有保障的。
Gold will not buy everything.
黄金不能购买一切。
I'm poor, but I always enjoy myself! he said. I don't know why!
“我很穷，但我总是过得很愉快！”他说，“我不懂为什么！”