Many readily acknowledge that the Arctic is an extraordinarily complicated system in which ice conditions are determined by winds, currents and both air and sea temperature.
许多专家欣然承认北极是一个非常复杂的系统，其冰雪状况是由冰、气流，空气温度和海洋温度所决定的。
NOx is produced when the nitrogen from the air reacts with oxygen under high engine temperature and pressure conditions.
在高温高压下，空气与氧气反应，产生了氮氧化物。
In the tightly sealed structure, scientists adjust soil moisture and water tension as well as air temperature and humidity to mimic the conditions that rice would face during droughts.
在高度封闭的建筑里，科学家们调节土壤湿度、水张力以及空气温湿度来模拟水稻在干旱时面临的境况。
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