这名网友还补充说，麦田圈直径长达200米，中间的图案让人联想起太阳系。
The netizen added that the crop circle was 200m in diameter and the mysterious logo in the middle called to mind the solar system.
这些火山位于直径约一千米的洼地中。洼地中间是一个充满泥水的圆形湖。
The very volcanoes are located in hollows, about half a kilometer in diameter. In the center of a hollow there is a round lake filled with mud.
其它类型的设计则在中间有一个圆形的剪切块，使其适合井眼内管柱的直径以便当管柱位于井眼内时能够密封井眼。
Other designs have a circular cutout in the middle that corresponds to the diameter of the pipe in the hole to seal the well when pipe is in the hole.
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