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.
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 B-2 Spirit stealth bomber is one of the most survivable aircraft in the world. It remains the only long-range, large-payload aircraft that can penetrate deeply into protected airspace.
B - 2幽灵隐形轰炸机是世界上生存能力最强的飞机之一，也是唯一能深度突防的远程重型飞机。
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