First, change of the social external relation in the village.
第一、乡村社会外部关系的变化。
Modern science, result from the enlightenment of the 17 th century, is characterized by mechanism and reductionism. In essence, it is a manifest of ideas of external relation in science.
17世纪经启蒙运动而产生的现代科学以机械论和还原论为特征，其实质是外在联系观在科学上的表现。
Without the external cue, the difference accumulates and so the internally regulated activities of the biological day drift continuously, like the tides, in relation to the solar day.
如果没有外界提示信号，这种差异就会积累，生物的日常内部调节活动就继续进行，像与太阳日有关的潮汐活动那样。
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