Ballvalve
球型人造瓣膜
🗣️ 情景例句
He is with someone right now. Would you hold?
他现在在会客。你可以稍等吗？
His necktie is behind the book case.
他的领带在书架后面。
It is said that the nerve poison is the more primitive of the two, that the blood poison is, so to speak, a newer product from an improved formula.
据说，神经毒液在两种毒液中是较为原始的一种，而溶血性毒液，打个比方说，是根据改良配方生产的一种较新的产品。