Valvotomy
瓣膜切开术
🗣️ 情景例句
He applied to Columbia,
他申请了Columbia大学。
How long could the buyer expect your product to last?
购买者期望你们产品的使用期是多久呢？
He was on his way to a lecture, when a tourist stopped him and asked him for directions.
他走在去听课的路上，此时一位游客拦住他问路。