Keep proper length of pipe when put into the manhole .
布放后应保留适当长度于引进端人（手）孔或拉箱内。
When running with the proper stride length, your feet should land directly underneath your body.
当跑步时使用正确的步长，您的脚应该直接落在您身体的正下方。
When running with the proper stride length, your feet should land directly underneath your body.
当跑步时使用正确的步长，您的脚应该直接落在您身体的正下方。
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