The measuring system parameters according to the theory of light scattering and reflection are chosen to optimize the system.

根据光散射和反射的理论，测量系统参数被选择以优化系统。

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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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In the past 13 years, scientists have discovered more than 300 planets outside our solar system, but they have done so indirectly, by measuring changes in gravity, speed or light around stars.

过去的13年中，科学家已发现我们太阳系以外的行星300多颗，但都不是直接观察到的，而是通过测量恒星周围引力、速度或光的变化而发现的。

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