intact ecosystem

例句：

1. 1. The ecosystemis intact, with no signs of humaninterference.
   这个生态系统完好无损，没有人类干扰的迹象。
2. 2. Theancient ruins are still intact, providing a glimpse into the past.
   古老的遗迹仍然完好无损，为我们提供了对过去的一瞥。
3. 3. The forest was once intact, but now it's overgrown with weeds.
   这片森林曾经完好无损，但现在却被野草覆盖。