Someone who is an expert in building bridges could be called an engineer. It is important to have a qualified engineer when building a bridge.
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An Expert Aviator is called an "Ace".
A cultures expert is called an ethnologist.
what ia an expert pilot called
A bully expert is called a bullnation
A grammar expert is called a grammatician or a grammarian.
The Chinese bridge is called Kangshaun great bridge
Expert advice or expert guidance.
An expert in his field is often called a specialist or an authority.
an expert on China is called a sinologist.
A cultures expert is called an ethnologist.