roots of giant tropical trees have pushed their way through cracks in the limestone 大型热带树木的根系 却已穿透石灰岩裂缝

170. Away from the life-giving rays of sunshine
     这里远离给予生命的阳光
171. one might not expect to find plants.
     似乎不太可能会有植物
172. But in the darkness of the cave tunnels
     但是在黑暗的洞穴通道内
173. roots of giant tropical trees have pushed their way through cracks in the limestone
     大型热带树木的根系 却已穿透石灰岩裂缝
174. to reach the flooded caverns.
     伸入到水洞之中
175. Without this water
     如果没有这些水
176. the Yucatan's forest could not grow so luxuriantly.
     尤卡坦半岛的森林不可能长得如此茂盛

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 173 行