本文利用多区首次碰撞几率，推导计算圆柱形控制棒黑度的公式。

In this paper, the multi-region first collision probabilities are used to derive the formula for calculating blackness of a cylindrical control rod.

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围绕“碰撞空域”的较大圆柱形叫做“保护空域”(PAZ)，其大小在航程的不同阶段根据碰撞风险而改变。

The larger cylinder, which surrounds the CAZ, is the Protected Airspace Zone (PAZ). It changes in size during the different phases of a flight, according to the risk of a collision.

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