Output is the result of acquisition, not its cause; learner production does not contribute directly to acquisition.

输出是习得之结果，而非原因，学习者输出不直接促进习得。

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He has asked the Justice Department to investigate the grey market, a step that will treat a symptom of the shortage but not its cause.

他已经要求司法部Justice Department介入调查上述灰色市场，但这只是对药品短缺治标不治本的步骤。

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Science is the solution to stem rust, not the cause of its return.

科学是根茎锈病的解决办法，而不是其复发的原因。

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But many analysts in Jakarta believe that ethnic and religious prejudice is simply the way the unrest manifests itself, not its cause.

ECONOMIST: Indonesian Muslims are seeking a political voice

Photos show the trim tab departing the plane six seconds into the accident sequence, meaning the break may have been a result of the mishap, not its cause.

CNN: NTSB: Pilot overwhelmed by g-forces in Reno crash

The Justice Department has disputed this study, but its own caginess about its classification system has not helped its cause.

ECONOMIST: A mixed inheritance for America's next attorney-general