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Living objects in nature rarely move in a perfectly straight line.
生命物体在性质上很少在一个完美的直线。
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Demand is the need for the objects under certain living conditions.
需要是在一定的生活条件下，主体对客观事物的需求。
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Demand is the need for the objects under certain living conditions.
需要是在一定的生活条件下，主体对客观事物的需求。
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