相关短语
1. originate as... 以……出现/起源2. a means of survival 一个生存伎俩3. develop into 发展成为4. be allowed to 被允许5. grow steadily 稳定增加
6. twice in history 历史上两次7. participate in 参加;参加8. is considered to be(as)被认为是9. what is more 另外10. offer sb. help 给某人提供帮助11. be similar to 与……相同


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