新概念英语第二册知识点讲解-Lesson 77 A successful operation 一例成功的手术.doc
★Lesson 77 A successful operation
★last vi. 持续，延续（常跟一个表示时间的名词或短语，没有被动语态）
last直接加时间或加for+时间
The meeting lasts (for) three hours.
The war between the two countries lasted (for) over three years/until 1453.
★prove v. 显示出
① vi. 显示，表明
prove +adj.
It proves difficult to do the job by herself...