有些游泳运动员自由泳做6次打腿(一个完整的自由泳划手周期内作6次打腿)，但有些运动员则作两次或者四次。
Some swimmers kick with a six-beat kick in freestyle (six kicks for each stroke cycle), while others use a two-beat kick or a four-beat kick.
有些游泳运动员一天可以轻易的游15,000码，但其它的一些运动员可能连2000 ~ 3000码都很难超过。
Some swimmers can handle 15,000 yards a day, while others may not be able to go more than 2,000 to 3,000.
有些人在唱歌，有些人在画画，其他人在游泳。
Some people are singing; some are drawing; others are swimming.
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