To ponder interminably over the reason for one’s own existence or the meaning of life in general seems to me, from an objective point of view, to be sheer folly.
总体上在我看来，从客观的角度，没完没了地思考自己为什么会存在，或者是生命有什么意义，是非常愚蠢的行为。
Objective To explore a general model for evaluating and predicting environmental pollution in order to make a quantitative description of controlling environmental pollution.
目的探索一种评价和预测环境污染程度的一般模式，以便能定量地描述环境污染控制和改善水平。
Objective to understand the status of awareness on AIDS among the general public to provide basic data for health education on AIDS prevention and control.
目的了解公众对艾滋病有关问题的认知状况，为防治艾滋病健康教育提供基础资料。
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