difference cochain

例句：

1. 1. The engineer used a cochain to connect the two pieces of metal together.
   工程师用一个链子将两块金属连接在一起。
2. 2. The scientist discovered a new cochain that could be used to make stronger materials.
   科学家发现了一种新的链状结构，可以用来制造更坚固的材料。
3. 3.The cochain was designed to improve the durability of the material.
   这种链状结构被设计用来提高材料的耐用性。