以下为句子列表：
英文: China urgently needs to develop methodologies for environmental risk assessment (ERA) and to identify risk stressors and their environmental exposure and adverse effects on a regional scale.
中文: 摘要随着环境中能够检出的有毒污染物种类不断增多，基于制定环境标准来控制有毒污染物的传统方法正在受到挑战，而环境风险评价研究己成为当前环境领域研究的热点。
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