逗号前的这半句(Poor in-person lectures could be replaced by online ones from the best in the world )为主语,动作为(freeing up time for the small-group teaching which students value most.) 8 D4 z7 X2 U8 Q& E2 W师生互动少的讲座会被在互联网的同类之中最棒的所替代,这一行为为被学生们所最为珍视的小组讨论解放了时间。4 T: I7 @# t4 C4 ?2 ?5 z2 Q; p