地震学家们知道断层在哪里，也能评估地震风险，但提前预报某次地震仍是一个难以达到的目标。

Seismologists know where faults are, and can assess earthquake risk, but predicting specific quakes ahead of time has been an elusive goal.

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心流的第一个必要条件是设定一个具有挑战性但不是难以达到的目标——你必须汇集你的资源并尽最大的努力才能完成的事。

The first requirement for flow is to set a goal that's challenging but not unattainable-something you have to marshal your resources and stretch yourself to achieve.

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但是这项新的研究也发现了一个令人瞩目的结论：那些能从难以达到的目标中摆脱出来的女孩子证实，从长远来看她们更不易罹患更加严重的抑郁症。

But the new study also found a remarkable corollary: those women who could disengage from the unattainable proved less likely to suffer more serious depression in the long run.

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