clam

(as) happy as a clam

1. 非常高兴; 非常满足

He is now as happy as a clam.

他现在相当满足。

clam up

1. 停止讲话; 变为沉默; 保持沉默

The suspect clammed up when lawyers asked about his girlfriend.

当律师问嫌疑犯有关他女友的事时, 他闭口不答。

Will you clam up! The boss is talking.

请你保持安静! 老板在说话。

You should not clam up on him.

你不应该拒绝跟他谈话。