为环状构造的化合物，环中一个或多个碳原子被另一元素的一个原子（诸如氮、硫、或氧）所取代。
Ring compounds in which one or more of the carbon atoms in the ring are replaced by an atom of another element such as nitrogen, sulfur or oxygen.
研究环状层理必须综合考虑构造位置、应力条件、沉积环境，沉积特征、围岩条件等因素的影响和控制作用。
The tectonic location, stress condition, sedimentary environment, sediment characteristic and wall rock condition are the elementary factors considered in loop bedding study.
该区地表氡气高值异常呈环状产出，并严格受构造控制。
In this area, the ground Radon high value anomaly presents annular pattern, and is controlled strictly by structure of the geothermal field.
采用了双环控制结构，先构造内环状态反馈以改善对象动态特性，然后按照内模控制原理设计外环的控制器。
First, the state feedback is used to improve the process static and dynamic performance. Then, the controller is designed based on the internal model control principle.
采用了双环控制结构，先构造内环状态反馈以改善对象动态特性，然后按照内模控制原理设计外环的控制器。
First, the state feedback is used to improve the process static and dynamic performance. Then, the controller is designed based on the internal model control principle.
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