他注意到这项研究的局限性，比如很难确定自杀行为原因。

He noted limitations to the study, such as the inability to determine the cause of the suicidal behavior.

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研究的局限性包括无法比较这些方法的专一性。

Limitations of this study include inability to compare the specificity of these methods.

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研究的局限性，在于缺乏长期的认知随访，以及身体或神经解剖学试验。

Study limitations included lack of long-term cognitive follow-up and lack of physical or neuroanatomical testing.

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