电子烟引发疾病的罪魁祸首-化学污染物
<p><span word="Chemical">Chemical</span> <span word="contaminant">contaminant</span> <span word="identified">identified</span> <span word="as">as</span> '<span word="key">key</span> <span word="focus">focus</span>' <span word="of">of</span> <span word="investigation">investigation</span> <span word="into">into</span> <span word="vaping">vaping</span> <span word="illness">illness</span></p><p>电子烟引发疾病的罪魁祸首-化学污染物</p><p><span word="US">US</span> <span word="officials">officials</span> <span word="are">are</span> <span word="working">working</span> <span word="to">to</span> <span word="track">track</span> <span word="down">down</span> <span word="a">a</span> <span word="chemical">chemical</span> <span word="contaminant">contaminant</span> <span word="that">that</span> <span word="is">is</span> <span word="potentially">potentially</span> <span word="behind">behind</span> <span word="a">a</span> <span word="rash">rash</span> <span word="of">of</span> <span word="lung">lung</span> <span word="illnesses">illnesses</span> <span word="connected">connected</span> <span word="to">to</span> <span word="vaping">vaping</span>.</p><p>美国官员正集中精力调查一种化学污染物，该污染物可能与电子烟引起的一系列肺部疾病相关。</p>
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