tapered rod string

例句：

1. 1. The tapered rodstring is used to connect two pieces ofmetal together.
   缩颈杆线用于将两块金属连接在一起。
2. 2. The tapered rodstring was the only thing that could holdthe heavy box open.
   缩颈杆线是唯一能撑开这个重箱子的东西。
3. 3.The engineer used a tapered rod stringto measure the distance between the two points.
   工程师用缩颈杆线测量了两点之间的距离。