名词短语
中文翻译：源头控制
同义词：
['source control', 'source monitoring']
例句：
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1.The government has implemented strict measures to withholding at source the illegal drugs.
政府已经实施了严格的措施，以源头控制非法药物。
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2. The company is committed to ensuring that all materials are withhelding at source before being released into the market.
该公司致力于确保所有材料在投放市场之前都经过源头控制。
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3. The research team conducted a study on the withholding at source of pollutants in wastewater treatment plants.
研究团队对废水处理厂污染物的源头控制进行了研究。