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.)6 Z, w% {* U( A& R8 K* b \* v; {' c
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。- K4 i5 [5 r; K) G