名词
中文翻译：恒定水平气球
同义词：
['constant-temperature balloon', 'constant-pressure balloon']
例句：
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1. Theconstant-level balloon was used to measure the temperature of the liquid.
使用恒定水平气球来测量液体的温度。
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2. The constant-temperature balloon was used to transport gases over long distances.
使用恒定温度气球将气体在长距离内运输。
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3.The constant-pressure balloon was used to create a vacuum for testing equipment.
使用恒定压力气球为测试设备创造真空环境。