名词
中文翻译：上层空间
同义词：
['upper atmosphere', 'upper stratosphere', 'upper troposphere']
例句：
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1. The pilot flewthe plane into the upper airspace to avoid a collision with an airplane.
飞行员将飞机飞入上层空间，以避免与另一架飞机相撞。
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2. The scientist conducted experiments in the upper airspace to study the effects of pollution on the environment.
科学家在上层空间进行实验，研究污染对环境的影响。
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3. The astronaut spent several hours in the upper airspace before returning to Earth.
宇航员在上层空间度过了几个小时，然后返回地球。