Fly At A Low Altitude(低飞), 此释义来源于网络辞典。
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At that time, China has not announced low altitude opens policy, airspace 70% it is military control, civil aircraft and train a plane and can not fly freely in the sky.
当时，中国还没有宣布低空开放政策，空域70%都是军管，民用飞机和训练飞机并不能自由地在天空飞行。
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