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课程多端同步更新，充分利用零碎时间。做题
海量精选试题，想练就练，瞬间提分。答疑
网校名师24小时在线答疑解惑。直播
名师大咖面对面，有问有大收获多。Mould spores, pollen, radon, carbon monoxide and dander all lurk within homes, seeping through cracks in walls and floorboards, brought in on clothing or produced by wood burners, gas hobs and detergents used in cleaning.
霉菌孢子、花粉粒、氡、一氧化碳以及头皮屑都潜伏在家中，或从墙体和地板的裂缝渗出，或由衣物带入，或来自燃烧木头的火炉、燃气炉和清洁时使用的洗涤剂。
Coughing, watery eyes, dizziness, sneezing, feeling tired and suffering headaches can be common signs of poor indoor air quality.
咳嗽、流眼泪、晕眩、打喷嚏、感觉疲倦和头痛皆可视为室内空气质量差的常见症状。
While more severe symptoms include eye irritation, rashes, muscle pain, respiratory problems, asthma, fever or chills, hearing loss, nose bleeds, wheezing and lung disease.
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