The report found that although some king penguins may be able to relocate to new breeding grounds closer to their retreating food source, suitable new habitats would be scarce.
2019年12月六级真题（第三套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
VERB
退避;后退;离开
If you retreat, you move away from something or someone.