as happy as a clam
You look as happy as a clam.
= You look very happy.
（你们看起来真是快乐似神仙啊！）
其实这个俚语完整的说法是 as happy as aclam at high tide（像涨潮时的蛤蛎一样快乐），high tide 就是『涨潮』。蛤蛎跟开心有什麽关系呢？人们通常在退潮时才会去海滩捡蛤蛎，所以涨潮时的蛤蛎既不用担心有生命危险，又可以饱食海中的浮游生物，当然很开心。沿用到後来 at high tide 被省略了，所以就用 as happy as a clam
You look as happy as a clam.
= You look very happy.
（你们看起来真是快乐似神仙啊！）
其实这个俚语完整的说法是 as happy as aclam at high tide（像涨潮时的蛤蛎一样快乐），high tide 就是『涨潮』。蛤蛎跟开心有什麽关系呢？人们通常在退潮时才会去海滩捡蛤蛎，所以涨潮时的蛤蛎既不用担心有生命危险，又可以饱食海中的浮游生物，当然很开心。沿用到後来 at high tide 被省略了，所以就用 as happy as a clam