Valvotomy
瓣膜切开术
🗣️ 情景例句
Dear Mr. Billet.
尊敬的比利先生。
How long will I have to wait?
我要等候多久呢？
A week before, he had completed a successful overland flight during which he covered twenty-six miles.
一周以前，他曾成功地进行了一次26英里的陆上飞行。