tapered-rod string

例句：

1. 1.The tapered rod string is used to connect the two pieces of metal together.
   缩颈杆线用于将两块金属连接在一起。
2. 2. The tapered rod string was used to make the bridge.
   缩颈杆线用于制作桥梁。
3. 3. The tapered rod string was used to hold the heavy object in place.
   缩颈杆线用于固定重物。