当鱼杆向下弯的时候，他知道线的另一端一定钓到了一条大鱼。父亲看着他技巧纯熟地在码头边沿和鱼周旋，眼神充满赞赏。
When his pole doubled over, he knew something huge was on the other end. His father watched with admiration as the boy skillfully worked the fish alongside the dock.
如果尾巴向下弯，其尾骨的末端大约可以延伸到飞节的位置。
In a curved downward position the tip of the tail bone should reach no further than the hock joint.
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