Brown notes that he can't say whether the childhood stressors actually cause premature deaths, as causation is always difficult to establish with a single study.

布朗指出，他不能说儿童时期受到刺激就是导致早逝的真实原因，因为仅通过一项研究往往难以确定原因。

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This paper analyzes causation of "uprightness maladjustment" in the single pipe, and puts forward corresponding prevention measure.

本文对单管顺流式“垂直失调”的原因进行分析，并提出相应的防治措施。

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