He points out that it is possible to identify specific factors as the primary causes of a particular historical event only relative to an initial set of background conditions.

他指出，只有相对于初始的背景条件，才有可能将特定因素确定为特定历史事件的主要原因。

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You will want to first identify the possible "causes" that lead to the problem "symptom." Now, causes can come from a variety of sources, some are.

你首先想去识别的是可能的导致问题“征兆”的“起因”。

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If the symptoms fade or go away when a person is away from the home and return when the person returns, an effort should be made to identify indoor air sources that may be possible causes.

如果一个人离开家时症状减轻或消失了，而一回到家症状又出现了，那么人们就应当确定可能引起症状的室内空气污染源。

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The sequencing of the human genome, the application of powerful genetic tools to identify human disease genes, and the development of powerful imaging and diagnostic tools now make it possible to tackle the causes of diseases more systematically and broadly than ever before.

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