Their proposal is to surround each light aircraft with two concentric, vertical cylinders of airspace that resemble virtual “hockey pucks”.

他们的方法是，在每一架小型飞机周围，以飞机为中心，设想一两个同轴的垂直圆柱体，像两个冰球的形状。

youdao

Many industry officials and analysts have long felt that China's extra vertical-airspace buffer has been so cautious as to be antiquated.

一直以来，许多业内管理人士及飞行员都认为中国在飞行高度层垂直间隔上的规定过于谨慎，甚至可以说是守旧。

youdao

Starting this year, vertical separation between aircraft cruising near each other in Chinese airspace will be slashed in half to 1,000 feet, already the standard in developed regions.

今年晚些时候，在中国空域飞行的飞机彼此之间垂直间隔可缩减一半至1000英尺，这已达到发达国家的水平。

youdao