You don't have to worry about me. I'm a good swimmer
你不用担心我。我水性很好。
He owed his survival to his strength as a swimmer
他是因为水性好才幸免于难的.。
She wants to become an Olympic swimmer
Cross-currents can sweep the strongest swimmer helplessly away.
即使最强壮的游泳者也会无助地被交叉水流冲走。
It surprised them all that she was such a fine swimmer.
她游得这么好，令他们都非常惊讶。