undung

例句：

1. 1.The forest was undung when we arrived.
   我们到达时森林里未被打扰。
2. 2. The ancient ruins are undisturbed by modern developments.
   古老的遗迹未受到现代发展的干扰。
3. 3. The stream flows untrodden through the dense forest.
   这条小溪在茂密的森林中自由地流淌。