"This dark chapter of history must now be carefully brought to light," he added.

他补充说：“这一黑暗的历史篇章必须谨慎地翻开。”

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Although the chapter implies customer interaction and involvement, Petschenik's coverage seems light.

尽管本章中含有用户交互和参与的意思，但是Petschenik的描写似乎清淡了一些。

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So the third chapter focuses on the measuring system. The operating principle (Light extinction method), the factors which influence the result and the resolvent to avoid them are explained.

第三章对此磁致偏振特性测量系统的搭建及工作原理（消光法）、影响测量结果的因素及解决方法、实验操作步骤等作了说明。

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