(as) dumb as an oyster

• 守口如瓶

(as) dumb as an oyster的用法和样例：

例句

1. I reckon we're safe as long as we keep mum.
   我想只要咱们守口如瓶，就可保安然无恙。
2. But the typically tight-lipped fund, known as GIC, continued to leave some key data under wraps.
   但这只通常守口如瓶的基金还是没有公布一些关键数据。