multiple-start screw thread

例句：

1. 1.The machine has a multiple-start screw thread for easy assembly.
   这台机器有多重起始的螺纹，便于组装。
2. 2. The construction of the bridge required the use of multiple-start screw threads.
   桥梁的建设需要使用多重起始的螺纹。
3. 3.The engineer designed the screw threads to ensure a secure fit with the bolts.
   工程师设计了螺纹以确保与螺栓的紧密配合。