... 准直通量：collimated flux 准直束：collimated beam 准直器，视准仪;平行光管，光轴仪：collimator ...
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The above definition of diffuse density implies that the input light is collimated and that all the output flux is collected.
上面定义的漫射密度意味著输入光先经过准直，然后收集所有的输出量。
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