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英国博物馆里收集了几种生活在桦树林里的蛾子,一种是白色的,另一种是黑色的。白色蛾子是工业革命前在曼彻斯特郊外的白桦林中采集的。黑色蛾子是工业革命后在同样的树林里采集的。蛾子为什么会由白变黑呢？这一现象引起了人们广泛的注意。经过调查和分析得知,主要原因是工业革
The British Museum has collected several moths that live in birch trees. One is white and the other is black. The white moth was collected in a birch forest on the outskirts of Manchester before the Industrial Revolution. Black moths were collected in the same woods after the Industrial Revolution. Why do moths turn from white to black? This phenomenon has caused widespread attention. After investigation and analysis, the main reason is industrial leather.