... 引申用法 extension usage 非任意性 non-randomicity 范畴化 categorization ...
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In contrast with point source pollution, non-point pollution is difficult to control and prevent because of its randomicity, intermittence, hysteresis and complexity.
与点源污染相比，非点源污染具有随机性、间歇性、滞后性、复杂性等特点，不易控制和治理。
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