该仪器采用千分表直接测量金属丝伸长量，提高了测量精度。

The instrument USES micrometer to measure the elongation of wire, the measuring precision is increased.

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分析了液压拉伸预紧的工作原理，并给出了螺栓伸长量和预紧力的确定方法。

The principle of the hydraulic pretension is analyzed, the calculation of bolt elongation and pretightening force is also given.

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万能拉力试验机可剖析整个测验的成果，例如伸长量、应力、应变、损坏值、平均值等。

Universal tensile testing machine can analyze the test results, such as elongation, average value, the stress, strain and damage, etc.

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I tie a spring to my back and I anchor it to the wall and see how much the spring stretches before the two forces balance.

我把弹簧一端系在背后,另一端固定在墙上,观察两个力平衡时弹簧的伸长量

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I move a little closer and I find the stretching is a different number.

我继续靠近讲台,发现弹簧伸长量有所变化

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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

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