primates relied on their social intelligence, 灵长类动物依赖于社会智力
Once upon a time, plants relied solely on wind or water to spread their pollen... 过去植物仅依靠风或水来传播花粉
relied on death for their success. 并非都依赖死亡而获得成功
so the Maya relied on the cenotes - the flooded entrances to the water-filled caves. 因此玛雅文化完全依赖于沼穴 ——地下水洞的入口