single cord

例句：

1. 1.The rope was made of a single cord.
   这根绳子是由一根线制成的。
2. 2.The artist used a single cord to tie the knot.
   艺术家用一根线来打结。
3. 3.The single cord was too thin to support the weight.
   那根线太细，无法支撑重量。