hump mould

例句：

1. 1. The bumpy road made it difficult to navigate through the forest.
   崎岖不平的道路使得穿过森林变得困难。
2. 2.The hard shell of the egg protects the developing embryo.
   蛋的硬壳保护着正在发育的胚胎。
3. 3. The outer layer of the skin is responsible for protecting the body from external factors.
   皮肤的外层负责保护身体免受外界因素的影响。