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重点讲解：
1. carry out 实施；执行；实行；
Engineers carried out a thorough inspection of the track.
工程师对轨道进行了彻底检查。
2. be based on 以…为基础；
The study was based on data from 2,100 women.
这项研究基于从2,100名女性那里收集来的资料。
3. be made up of （由…）构成的；（由…）制成的；
Food is made up of carbohydrates, proteins and fats.
食物由碳水化合物、蛋白质和脂肪构成。
4. find out (尤指特意通过努力)发现，找出，查明；
The investigation will try to find out where the guilt for the disaster really lies.
此调查将尽力查出灾难的真正责任所在。
