离开之前，科学家们决定通过抽样检测海拔一英里的博尔德市的空气，对在旅程中将会用来检测空气中硝基氯含量的设备进行检验。
Before leaving, the scientists decided to test the equipment they would use to detect airborne nitryl chloride on the cruise by sampling the air in Boulder, a mile above sea level.
他们计划对途经海洋的空气进行抽样调查，计算机模型预测这些海洋空气中硝基氯含量不会超过万亿分之五十。
The plan was to sample nitryl chloride levels in Marine air, which computer models predicted would not exceed 50 parts per trillion.
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