but it's only with the help of today's technology 但只有借助现代科技

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
177. The Maya knew that their lives depended on this water,
     玛雅人固然知道 它们的生活离不开这些水
178. but it's only with the help of today's technology
     但只有借助现代科技
179. that we've come to appreciate the full significance and scale of these flooded passageways.
     我们才能完全了解 这些地下水道的重要性及其规模
180. So far, more than 350 miles of underwater galleries in the Yucatan have been mapped,
     人们迄今为止已绘制了350英里的 尤卡坦半岛地下水系图
181. but still nobody yet knows the true extend of this subterranean waterworld.
     但仍旧无人知晓 这个地下水世界究竟有多大

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 178 行