as happy as a clam
非常开心
口语·形容非常开心满足
英文释义
to be very happy or content
例句
He's as happy as a clam playing video games all weekend.
典故来源
源自19世纪美国，完整说法是“as happy as a clam at high water”，涨潮时蛤蜊安全不被挖，比喻极度满足。