这管子内径宽十英尺。
确保管子或其它圆柱形工具的内径合适，通过拖动已知外径的圆柱体或管子(清管器)穿行其中。
To guarantee the inside diameter of a pipe or other cylindrical tool by pulling a cylinder or pipe (rabbit) of known outside diameter through it.
通径规的直径就是管子生产商所能够确保的每一管子说明书上的内径。
The drift diameter is the inside diameter (ID) that the pipe manufacturer guarantees per specifications.
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