从位移模态出发详细推导了应变模态的表达式；

The expression of strain modal is derived in detail on the basis of displacement modal.

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从位移的云纹图用位移导数法求得销钉孔中心水平截面上的应变。

The moire pattern is used to determine the strain on the horizontal section through the pinhole centre by displacement derivative method.

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如果从位移的角度，来思考这个问题，它也可以度量位移的旋转部分。

And, if you want to think about it in terms of motions, that also will measure the rotation part of the motion.

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Even though we started with a single vector, which is the position vector, we're now finding out that its derivative has to be a vector and the derivative of the derivative is also a vector.

即使我们从单个矢量出发,即位移矢量,我们现在也能得出它的导数是矢量,而且导数的导数也是一个矢量

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