以下为句子列表：
英文: If absolute absorbance measurements are required (i.e. for the measurement of molar extinction coefficients) the entire optical system will have to be calibrated to determine the mean free path length of the cuvette and the cuvette holder.
中文: 如果要求度量绝对吸收度（比如，对分子消光系数的测量），整个光学系统就要经过校准以确定小型管和小型管固定器的平均自由路径。
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