The engineers are also trying to develop an on-and-off "switch" where the glow would fade when exposed to daylight.
工程师们还试图研制一种间断式“开关”，当暴露在日光下时，光照会逐渐消失。
As daylight dwindles and temperatures drop in this forest in Perthshire, Scotland, beech trees (Fagus sylvatica) switch into power-saver mode.
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(Fagussylvatica)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.
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(Fagussylvatica)就进入了一种保存能量的状态。
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