... dx 变量x的一个无穷小变化，dy, dz, dr等类似 ds 长度的微小变化 ρ 变量 (x2 + y2 + z2)1/2 或球面坐标系中到原点的距离 ...
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用螺旋测微器测量水准仪平移的距离，从而得到钢丝长度的微小变化值。
The small variation of the steel-wire's length can be obtained by measuring the displacement of leveling bench with micrometer.
“关键点在于，这一实验能够辨识出极其微小的长度变化，哪怕比质子的直径还要小。” 霍根说。
"The key thing is that such experiments are sensitive to changes in the length of the rulers that are far smaller than the diameter of a proton, " says Hogan.
针对物理实验中对微小长度的变化的测量这一关键技术进行了分析，多视角地提出了解决这一测量技术的方法，并系统地归纳了几种该技术手段和方法。
The crucial technology to measure the variation of minimum length is analysed. The methods of the measurement are put forward in many ways and several technical methods are summed up systematically.
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