It is a circular hole with a diameter of 305 metres and 123 metres deep.
蓝洞是一个直径为305米，123米深的圆型大洞。
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.
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。
The ILM was stained and removed in a circular fashion 1-2 disc-diameter from the edge of the macular hole.
内界膜被染色，距黄斑裂孔边缘1 ~ 2个视盘直径环行剥除内界膜。
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