hang by a single hair

例句：

1. 1. The rope was so tight that it couldn't be easily hung.
   这根绳子太紧了，不容易挂起来。
2. 2. She hung her coat on the coat rack.
   她把外套挂在衣架上。
3. 3. The weight of the books made it difficult to hang them up.
   书的重量使得它们难以挂起。