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重点讲解：
1. 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。
2. spread out 相隔很远的；分散的；
The Kurds are spread out across five nations.
库尔德人散居在 5 个国家中。
3. center on （使）以…为中心；（使）注意力集中于；
The topic centers on the crisis in these two countries.
话题以那两个国家的危机为中心。
4. carry out 实施；执行；实行；
He pledged that there would be no whitewash and that the police would carry out a full investigation.
他保证将不会有任何掩饰，并且警方将进行全面调查。
