vertical airspace
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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。
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.
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