电子游戏和电视可能会让孩子们连续玩上几个小时，但它们对孩子的整体认知发展没有帮助。
Video games and TV might keep children engaged for hours on end, but they are not helpful to children's overall cognitive development.
第二章为中国传统灯具整体认知。
Secondly, Chapter II gives the overall awareness of Chinese traditional lamps.
第一步，整体认知，构造知识网络。
The first step, overall cognition, structure knowledge network.
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