Any knowledgeable wine merchant would be able to advise you.

　　任何一位內行的葡萄酒商人都能為你提出建議。

　　She is very knowledgeable about plants.

　　她對植物很在行。

　　I am knowledgeable and levelheaded.

　　我知識豐富、頭腦冷靜。

　　Being knowledgeable about various subjects.

　　具備多個學科的知識。