Numerous attempts to stop the leak have failed or not yielded the desired results.

我们尝试了很多方法，但这些措施不是失败了，就是没有达到预期效果。

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Though efforts to identify a building or structure of this size have not yielded any results.

虽然努力确定建筑物或构筑物这种规模没有取得任何结果。

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In spite of that, scientists are unable to effectively make this variety survive as micro-propagation and vegetative means have not yielded the desired result.

尽管如此，科学家们还是无法有效地使这个品种幸存下来，因为微型繁殖和营养方法并没有取得预期的效果。

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But these policies have not yielded the hoped-for diplomatic benefits regarding North Korea and Iran.

CENTERFORSECURITYPOLICY: Obama��s ��Nuclear Zero�� Rhetoric is Dangerous

Some analysts said he overpaid, and the deal has not yielded big returns.

FORBES: Magazine Article

But Millennium's gene databases have not yielded a single marketed drug, either for Millennium or any of the partners who ponied up big bucks.

FORBES: Biotech Battle Scars