shark [ʃɑ:k]

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n.鲨鱼，贪婪的人，老手

a large fish that has sharp teeth and a triangular fin on its back which can sometimes be seen above the water

They were killed by a shark. 他们被一条鲨鱼咬死了。
You're really a card shark. 你真是个打牌老手。