推挽式是一种有张力拉伸的环状结构。
图片中间的绿色环状结构的跨度大概有77光年。
The green ring structure near the center of the image is about 77 light-years across.
这本书的环状结构，试图在听众的心理上达到那种目的。
The looping structure of the book tries to work that out psychologically in its hearers.
两类环状片层的区别仅在于后者存在膜状结构。
The origin and function of the membrane-like structure have not been found out yet.
两类环状片层的区别仅在于后者存在膜状结构。
The origin and function of the membrane-like structure have not been found out yet.
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