Use a wire sling of a greater S. W. L whenever the exact weight of the load is unknown or there is a hazard to personnel.

当无法确定载荷的准确重量或对人员存在危险时，使用大于安全工作负荷的钢丝绳。

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The Walkman W Series is a wire free digital music player designed to conveniently and comfortably accompany its user to the gym, trail and treadmill.

ENGADGET: Sony unveils Meb Keflezighi Edition Walkman W Series, fills it with the marathoner's coaching wisdom