be an expert swimmer 熟谙水性
Every man, woman and child is an expert swimmer here.
这里的每个人，不管是男是女还是小孩，都是游泳高手。
An expert swimmer trained and employed to watch over other swimmers, as at a beach or swimming pool.
救生员经过训练的游泳专家，受雇照看其他的游泳者，例如在海滩上或游泳池旁。
Now I'm not an expert swimmer but I do know a good dive from a poor one, and this was not exactly medal quality.
我虽然不是专业游泳运动员，但是我还知道什么样的入水姿势是正确的。
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