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while for if 的区别 as if 和as though when and if meaning define if and when 语法if then fi的作用 及if扩展语法作用 difference of when and if words instead of as if if for while 区别 

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at the end of his term in office翻译 at the office翻译 attend to my word翻译 at the end of each year翻译 at the bottom of翻译 at the fixed time翻译 afewkindwordsforsuperstition翻译 was admitted into翻译 翻译at the age of atthetimeof翻译 

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