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重点讲解：
1. at least 至少
It'll cost at least 500 dollars.
这东西至少要花500元。
2. facial recognition 面部识别
A U.S. company has developed facial recognition software that can help police.
美国一家公司开发了一款面部识别软件，可以帮助警察抓捕犯人。
3. be based on 根据...；基于
The story is based on fact.
这个故事是根据真人真事写的。
4. be used for 用于...
The building is used for religious purposes.
这座建筑是用于宗教活动的。
