块骨 meaning in Chinese

massive bone

S would have shouted , but he knew that the wind would drown his voice . it was then he rejoiced at his precaution in taking the timber , for without it he would have been unable , perhaps , to reach the vessel - certainly to return to shore , should he be unsuccessful in attracting attention
唐太斯本来可以大声喊叫的，但他想到他的喊叫声会被风吞没的，这时他很庆幸自己预先想到，抱住了这块骨，要是没有它，他也许坚持不到登上那艘船的，而且如果船上的人没有看到他，船就过去了的话，那他就再也不能游回岸上了。