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.
It's a double stranded circular piece of DNA, meaning that the 3', 5'ends that hang off are joined back together again to form a continuous loop.
它是双链环状DNA,它的3'末端和5'末端首尾相连,构成一种连续环状结构
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