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重点讲解：
1. be based on 以…为基础；
The novel is based on a true story.
这部小说是根据真实的故事写成的。
2. be aimed at 旨在；目的是；
These measures are aimed at closing the gap between rich and poor.
这些措施旨在缩小贫富差距。
3. out of （表示比例）每…中；
Two out of three people think the President should resign.
有三分之二的人认为总统应当辞职。
4. break out （战争、战斗或疾病）爆发；
Fire broke out during the night.
夜间突然发生了火灾。
