swim是动词，而swimming则是名词，表示游泳这项运动。swimmer（游泳者）
例句
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 is swimming right now.---她现在在游泳。
My hobbies are painting and swimming.---我的兴趣bai是画画和游泳。
水利万物而不争,
而万物莫能与之争。
