But determining which case is right has been a challenge.

但要想确定实际是哪种情况又是一次挑战。

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In this case, age is the determining factor; but in other cases, it is not.

在这个情况下，年龄是决定因素；但在其它案例中却不是这样。

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But the determining factor here may be intelligence.

但是这里的决定性因素可能是智力。

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But the determining factor here may be intelligence.

但是这里的决定性因素可能是智力。

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