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古代一般是靠点蜡烛来照明,烛光不利于阅读,可是古人在看书或背诵时,摇头晃脑的动作,帮颈部缓解了不少压力,这样就算看书看久了,也缓解了脑部和颈部神经,眼睛得到舒缓,因此古人才没有因为夜间阅读而对眼睛造成很大的伤害。当然,挑灯夜读也得适度才可以,要是书上的字小得跟蚂蚁似的,视力再好也于事无补。在没有出现印刷版之前,古人一般是手抄书籍,字体当然也会比较大一点,这样不用把书
In ancient times, candles were used to illuminate the candles and the candles were not conducive to reading. However, when reading or reciting, the ancestors shook their heads and brain acuated to relieve the pressure on the neck so that if they read for a long time, they relieved the brain and neck Nerves, eyes get soothing, so the ancients did not cause much damage to the eyes because of night reading. Of course, it is okay to choose a suitable lamp for night reading, if the book is small with ants, and no matter how good my eyesight is, no matter how good the eyesight is. In the absence of a printed version, the ancients generally handwritten books, fonts, of course, will be relatively large, so do not put the book