Epidemiological investigations so far have not revealed a common source or route of exposure, and these investigations are now being extended in scope.
流行病学方面的调查目前还没有找到共同的接触源或接触途径，目前正在扩大调查范围。
The most successful and common treatment is the process of "desensitisation" which involves a slow exposure to the phobia source.
最成功和常见的治疗是消敏法(desensitisation)，即慢慢地暴露于恐惧源。
The workplace is a common source of exposure to asbestos fibers, as asbestos was widely used in the past for both thermal and acoustic insulation materials.
工作间是一种常见的来源接触到石棉纤维由于石棉被广泛使用在过去两、热隔音材料。
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