尽量保持稳定的节奏，并且每次划水时都需要将胳膊尽量伸展拉长。
Try to maintain a steady rhythm, with great extension of the hands on every stroke.
他以众人吃惊的速度从衣服里伸展拉长，他的声音开始变得嘶哑，时而走调，时而颤抖。他的脸蛋突然变得棱角分明，显得难看。
He grows out of his clothes with indecent haste; his voice grows hoarse and breaks and quavers; his face grows suddenly angular and unsightly.
伸展也可以拉长肌键单位，减少活动时在肌键上的张力，进而减少会导致肌腱变性的化学变化。
Stretching can also elongate the muscle-tendon unit, reducing the tension placed on the tendon during activity, thereby reducing the chemical changes that cause degeneration.
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