我将要提取时间，就像我在，弹力那个例子里那样。
I'm going to take the time derivative just as I did in the case of the spring.
同样在这段时间里锻炼骨盆肌肉会增加肌肉弹力，肌肉发达，会有助于它们在分娩后恢复到原来的状态。
Likewise, exercising the pelvic muscles with Kegels during this period may enhance their elasticity, strengthen them, and speed their return to normal tone.
但是，随着时间的流逝，胶原蛋白会慢慢地减少，弹力素丧失了它的活力，身体的综合肌能也都退化了。
Over time, however, collagen deteriorates, elastin loses its spring, and the body's synthesis of both decreases.
考虑到空气的粘性，理论计算了弹力球的运动位移随时间的变化规律。
With regard to air viscosity, the law of time dependent displacement of elastic ball is studied in theory.
结果加用弹力网套固定头皮静脉留置针组的保留时间延长。
Results the new fixation method lengthened the indwelling time of scalp intravenous needle.
同时，可以利用调整阀瓣的自重、弹簧的弹力以及阀瓣的底孔大小来确定阀门的开启压力和启闭时间。
Meanwhile, the flap valve can be used to adjust weight, spring tension and the bottom outlet valve flap valve opening size to determine the pressure and open and close time.
当需要一定时间来适应满眼的皮肤与弹力裤衩时，那也是相当的令人耳目一新，真的。
While the masses of skin and spandex take a while to get used to, it's all rather refreshing in a way, really.
我准备买一些弹力鞋，在长时间的骑行中我的腿会舒服些。
Later during the day, i decided to buy some click shoes, as it will be more comfortable for the legs on long distances.
我准备买一些弹力鞋，在长时间的骑行中我的腿会舒服些。
Later during the day, i decided to buy some click shoes, as it will be more comfortable for the legs on long distances.
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