这个城市的研究人员首先调查了一般的怀疑对象，如空气污染、花粉和霉菌等。
The city's researchers first turned to the usual suspects, such as air pollution, pollen and mould.
我们下周去做一个空气污染的调查吧。
首项研究空气污染与疾病关系的重要调查发现，住在主干道旁边有可能增加患痴呆的风险。
Living near a main road increases the risk of dementia, the first major research into air pollution and disease has shown.
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