当然，大约200年前，印第安纳波利斯是一片山毛榉和枫树的山地森林。
Of course, roughly 200 years ago, Indianapolis was an upland forest of beech and maple.
当森林里的白天在减短，气温在降低时，苏格兰佩思郡的山毛榉(Fagus sylvatica)就进入了一种保存能量的状态。
As daylight dwindles and temperatures drop in this forest in Perthshire, Scotland, beech trees (Fagus sylvatica) switch into power-saver mode.
森林里生长的山毛榉。
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