- 一瓶子不响，半瓶子晃荡 yīpíngzibùxiǎngbànpíngzihuàngdàng empty vessels make the most noiseliterally meaning a full bottle makes no sound while a half-filled bottle sloshes; used to describe people with little knowledge who like to show off
- 半瓶子醋 bànpíngzicù dabblerA person with only a superficial knowledge of a subject who likes to show off or speak as if they were an expert; an amateur who makes a display of little knowledge.