所有国会议员每两年重新选举一次。Every two years all the congressmen stand for re-election.众议院的四百三十五名议员每两年选举一次.The 435 members of the House are elected every two years.他每两年有一次探亲假.He gets home leave every two years....

“每两年”的英语可以翻译为：per biennium，biennially ...