词汇讲解：
1. launch vt. 开办;发起;使开始从事
例句：We launched a new project.
我们开始从事一个新项目。
2. criticize vt. 评论, 批评
例句：He criticized her in a very unfair way.
他极不公平地指谪她。
3. remind vt. 使想起
例句：He reminded me to lock up the house when I go out.
他提醒我外出时把屋子锁起来。
4. principal n. 负责人, 校长
例句：He is the principal of this school.
他是该学校的校长。
5. manipulate vt.熟练控制[操作]
例句：Primitive man quickly learned how to manipulate tools.
原始人很快就学会了使用工具。
6. feedback n. 反馈, 反馈信息
例句：The more feedback we get from viewers, the better.
从观众那儿得到的反馈越多越好。
7. literacy n. 识字, 有文化, 会读写
例句：I can't believe that he failed the literacy test.
我无法相信他识字测试不及格。
8. recognition n. 认识; 认出; 识别; 承认; 认可
例句：She hoped she would avoid recognition by wearing dark glasses and a hat.
她戴上墨镜和帽子, 希望人们认不出她来。
9. retain vt.保持; 保留；止住; 容纳
例句：This village still retains its old world character.
这个村庄仍然保持着古色古香的特色。
10. ridiculous adj. 可笑的, 荒谬的,愚蠢的,荒唐的
例句：It's the most ridiculous thing I've ever heard in my life.
这是我有生以来听到的最为荒唐可笑的事。
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