单词：humic substance
humic substance的用法和样例：
例句
- Humic substances are known to coat membrane filters.腐殖质是已知能够覆盖滤膜的物质。
- Soil humic substance is an important natural pool of THM precursors in raw waters.土壤腐殖质是水源三卤甲烷前驱物质的重要天然来源。
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