• 1. a slack rope: 松弛的绳子
• 2. a slack rope detail: 松弛的绳子

• 1.A rope is slack if it hasn't been pulled tight.
  如果一根绳子没有拉紧，那它是松的。
  dict.yoduao.com
• 2.It has a distinct advantage that you can easily "grab" the draw if you start to slip, and that you can use the pull on the draw to bring up slack out of the rope.
  不过，好处是当你有点要滑动时可以“抓住”快扣，且顺势带出贴紧岩壁的绳子。
  dict.yoduao.com

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