导向扩张头中部的外直径大于通管的外直径。
The external diameter of the middle part of each guiding expansion head is larger than that of the through pipe.
是一个滑动配合联轴器，连接管或管道的外直径。
The solid sleeve is a slip fit coupling that fits the outside diameter of the tubing or fitting.
这两道天拱可能直径长达200英尺，高达200英尺，如果户外条件较好，可以在1000英尺外看见。
The arcs may be as long as 200 feet across and 200 feet high, and depending on outdoor conditions, they may be visible up to 1, 000 feet away.
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