火山岩将洞穴和外界隔绝开，是温度维持在一个舒适的水平，全年温度介乎华氏63至68度之间。
The volcanic rock that insulates the cave keeps the temperature at a comfortable level, between 63 and 68 degrees Fahrenheit, year round.
并通过数学模型对节流阀的开度进行了控制。
The degrees of opening of throttle are controlled through the model of mathematics.
文章提出了一种计算无连续开度反馈的电动调节阀开度的算法，并应用于实际工业过程控制系统，取得了很好的控制效果。
An algorithm calculating the opening degree of the electronic valve in succession is proposed, and the application in the engineering practice proves that the algorithm has a good control result.
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