加州大学戴维斯分校环境科学与政策系教授黑斯廷斯，是世界上利用数学模型(方程组)来理解自然系统的顶级专家之一。
Hastings, a professor in the UC Davis Department of Environmental Science and Policy, is one of the world's top experts in using mathematical models (sets of equations) to understand natural systems.
对航迹云的现场研究一直是很稀少的。威斯康星大学白水分校的戴维·崔维斯说，我们所了解到的大部分对航迹云的研究都是基于模型研究的。
Field studies of contrails are rare, says David Travis of the University of Wisconsin-Whitewater. Most of our understanding of their effects is based on model studies.
对航迹云的现场研究一直是很稀少的。威斯康星大学白水分校的戴维·崔维斯说，我们所了解到的大部分对航迹云的研究都是基于模型研究的。
Field studies of contrails are rare, says David Travis of the University of Wisconsin-Whitewater. Most of our understanding of their effects is based on model studies.
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