Stretch the rubber ring and install it at the proper location at the spigot of the pipe about to be laid.

将橡胶圈展开，并将它安装在下一节将要安装的管道的插口端上正确的位置。

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Stretch the rubber ring and install it at the proper location at the spigot of the pipe about to be laid.

将橡胶圈展开，并将它安装在下一节将要安装的管道的插口端上正确的位置。

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