(2013英语一Text 3)As so often, the past holds the keys to the future: we have now identified enough of the long-term patterns shaping the history of the planet, and our species, to make evidence-based forecasts about the situations in which our descendants will find themselves.
词汇积累：forecast 预示;descendant 后代、子孙
句子分析：本句主干为the past holds the keys to the future，冒号后为同位语对前面信息进行解释说明。冒号后内容相对较复杂，其中包含多个定语如shaping the history of the planet, and our species、about the situations、in which our descendants will find themselves及目的状语to make evidence-based forecasts。
参考译文：经常会这样，过去紧握着通往未来的钥匙：现在，我们已经识别出充足的塑造地球和人类的历史的长期模式，这使得我们可有根据的预测子孙后代的生存环境。
