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所有國會議員每兩年重新選舉一次。Every two years all the congressmen stand for re-election.眾議院的四百三十五名議員每兩年選舉一次.The 435 members of the House are elected every two years.他每兩年有一次探親假.He gets home leave every two years....

“每兩年”的英語可以翻譯為：per biennium，biennially ...