她为了取水沿途清扫着高低不平的山路，因为大坝建立了一个大湖位于未被触及的几百米以下的谷底。
She scavenges along the rough mountain roads for water while the giant lake created by the dam lies untouched a few hundred meters below on the valley floor.
驾驶员们可以自由选择航线，但必须保持在300米以下飞行，而且不能太靠近曼哈顿的摩天大楼。
Pilots have some freedom to pick their own route, as long as they stay under 300m and do not stray too close to Manhattan's skyscrapers.
现在估计地球上大约一半的生物生活在地下深度约5千米以下的地方。
Current estimates suggest that half of all the living matter on Earth lives underground, at depths of up to 5km.
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