实际上，每个晶体就像一个百页窗，或是让光通过、或是把光挡祝。

Each crystal, in effect, ACTS like a shutter, either allowing light to pass through or blocking the light.

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铅挡野输出因子与标准限光筒和铅挡野大小有关；

Output factor of lead block fields was related to standard applicators size and lead block fields side;

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