grapnel traveling crane

例句：

1. 1. The ship's anchor was securelyfastened to the dock.
   船的锚被牢固地系在码头上。
2. 2. Therope was so thick that it could notbe easily pulled through the hole.
   绳子太粗了，无法轻易穿过这个洞。
3. 3.The sailors used grapnelsto secure the boat in place.
   水手们用锚索将船固定好。