... 静止显影 stand development 镜后焦点 back focus 镜后快门 behind-the-lens shutter ...
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镜后焦点
Retromirror focus
以上为机器翻译结果，长、整句建议使用 人工翻译 。
该方法基于共轴球面光学系统的成像原理，通过读数显微镜对吸入待测液体后毛细管的焦点位置进行单一参数的测量，进而计算出待测液体的折射率。
The refractive index was obtained through measuring the focal position of a capillary filled with the liquid by a reading microscope, and doing a calculation with an analytic formula.
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