Mechanical ascenders can be handy for ascending fixed lines on big peaks, but are not a suitable alternative to prusiks as shown here because their sharp teeth could damage a rope during a big fall.

• 机械上升器用于手持上升修有路绳的陡壁，但不适合代替这里所示的普鲁士结。因为上升器锋利的尖齿在坠落的时候会损坏绳子。