twist of wood

例句：

1. 2.
   比喻
2. 3.
   比喻
3. 1. The old tree had a twist of wood that made it difficult to climb.
   这棵老树有一个弯曲的部分，很难爬。
4. 2. The problem was a twist of wood that no one could solve.
   这个问题是一个难以解决的困难。
5. 3.The journey was a twist of wood that tested their patience and perseverance.
   这段旅程是一次曲折的考验，考验了他们的耐心和毅力。