The structural properties of these objects are investigated in the study of groups, rings, fields and other abstract systems, which are themselves such objects.
这些对象的结构性能进行了研究的群，环，域和其他抽象的系统，其本身这样的对象的研究。
The most important of these are rings, and fields.
其中最重要的是戒指，和领域。
Weedy roadsides were like museums and the fields of corn and beans around us were like circuses with many rings.
杂草丛生的路边就像一座座博物馆，而我们周围的玉米地和大豆田就像拥有很多圆形场地的马戏场。
Radical ring expansion is a new strategy to synthesize the medium-sized and even large rings, nowadays, it is one of the important research fields of organic chemistry.
而自由基扩环反应是合成中环乃至大环有机化合物的一种有效的新方法，已成为当今有机合成化学的前沿研究领域之一。
Radical ring expansion is a new strategy to synthesize the medium-sized and even large rings, nowadays, it is one of the important research fields of organic chemistry.
而自由基扩环反应是合成中环乃至大环有机化合物的一种有效的新方法，已成为当今有机合成化学的前沿研究领域之一。
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