游泳很快用英语怎么说

游泳很快用英语可以说"to swim fast"。
"To swim"是英语中游泳的基本动词，而"fast"是形容词，描述动作的速度。
例句:
"She swims fast and always wins the race." (她游得很快，总是赢得比赛。)
"He trained for months to swim faster than his opponents." (他训练了几个月游得比对手更快。)
"The fish can swim very fast in the water." (鱼能在水中游得很快。)