Check the wear of the electric brush and see whether the constant force spring has distorted or not. Over-worn electric brush and distorted force spring should be replaced.

检查电刷磨损情况，及恒力弹簧是否变形，电刷磨损过多或恒力弹簧已变形予以更换。

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These seasons can not be forced any more than one can force the coming of spring by pulling at tender blades of grass to make them grow.

四季无法人为的加以改变，就如一个人无法用拔苗助长的方法急令春天的到来。

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You may alter the mousetrap but you are not allowed to change the way the spring and bar function except to reduce the force when it is triggered.

你可以改装老鼠夹，但是不允许改变弹簧和铁杆的运行方式，除非是减小老鼠夹被触发后的弹力。

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Newton is not going to come and tell you what force the spring will exert when it's pulled by some amount.

牛顿不会过来告诉你,弹簧被拉伸一定量时会产生多大的力

耶鲁公开课 - 基础物理课程节选

The force may taper off, the force may not be given by a straight line, but for modest deformations, every spring will have a linear regime in which the force is linearly proportional to the stretching.

它产生的力可能会渐渐消失,力的曲线可能不是一条直线,而有轻微的弯曲,每个弹簧都有一个线性区间,在这一区间内,力和伸长量是线性关系

耶鲁公开课 - 基础物理课程节选

If the election were not held by early November, winter weather would make voting impossible and force a delay until spring of 2010, according to Afghanistan's ambassador to the United States, Said Jawad.

CNN: Abdullah ready for runoff with Afghan President Karzai