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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Use an ordinary hinge door hinge only rely on the bite force can not help the test of time, could be considered to spring, either to the inside or outside the door, you can open and close easily.

用普通的合页门，只是依靠合页的咬合力量也禁不住时间的考验，可以考虑采用地簧，门无论向里还是向外，都可以开合自如。

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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