But alternative explanations are hard to find.
但很难找到其他的解释。
What, if any, alternative explanations could account for the empirical material?
如果有的话，对于实证材料有有无其他解释？
Be sure to provide alternative explanations, and do not simply restate the results.
请务必提供替代的解释，而且不是简单地重复结果。
Be sure to provide alternative explanations, and do not simply restate the results.
请务必提供替代的解释，而且不是简单地重复结果。
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