入水前花点时间伸展身体。
Take some time to stretch your body before you enter the water.
文章认为，在时间伸展变换的情况下，频散方程将不是一个圆，而是一个椭圆。
It is deemed that with the variation of time extension, the dispersion equation should be an ellipse rather than a circle.
如果大一点的孩子有超过一个小时的家庭作业，鼓励他们安排短暂的休息时间来伸展身体。
If older children have more than an hour of homework, encourage them to schedule a short break to stretch.
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