大多数病例是散发性的，主要是由于环境因素。
The majority of cases are sporadic and due mainly to environmental factors.
一本古书散发出来的熟悉的霉味源于纸张或其它如装订线等材料发出的数百种不同的挥发性有机化合物。
An old book's familiar musty smell is due to hundreds of different volatile organic compounds gassing out from the paper and other materials, such as the binding.
不仅具备不散发甲醛、苯、氨气、VOC（挥发性有机化合物）等有害气体的优点，而且具有吸附有害气体的功能。
Not only have the advantages of sending no harmful gases of formaldehyde, benzene, ammonia and TVOC (volatile organic compounds) out, also with the function of absorbing diversified pernicious gases.
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