n.蛤；沉默寡言的人
vi.保持沉默；挖蚌
Everybody shut up like a clam as soon as you mention it. 你一提及此事，大家便都闭口不言
He is a clam about his business dealing. 他对自己的生意买卖守口如瓶。
用作不及物动词 (vi.)It started off well, but he seemed to clam up towards the end. 刚开始很，但是最后他似乎有些沉默。
I used to clam up when the talk turned to politics or economics 当话题转到政治或经济问题时，我常沉默不语。
n.蛤壳；蛤壳式挖泥机
