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重点讲解：
1. for the most part 大部分；多半；通常；
Professors, for the most part, are firmly committed to teaching, not research.
大多数教授都投身于教学，而不是研究。
2. come to life （使）变得生动；（使）变得有趣；
In my dream all my toys came to life.
我的玩具在梦里都活过来了。
3. lift off （飞机、火箭等）起飞，升空，发射；
The plane lifted off and climbed steeply into the sky.
飞机起飞并迅速爬升至空中。
4. over and over again 一再；再三；反复；
'I don't understand it,' he said, over and over again.
“我不明白，”他反复不停地说。
