Dragonflies have six legs but cannot walk!

蜻蜓有六条腿，但是它们还是不能走！

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It may turn out that vitamin E plays a role in prevention but cannot undo serious damage.

结果可能是，维生素E在预防中会起作用，但不能消除严重的损害。

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Psychologist Nina Strohminger at the University of Pennsylvania, who was not involved in the study, says she wants the effect to be real but cannot rule out some unknown confounding variable.

没有参与这项研究的宾夕法尼亚大学心理学家尼娜·施特罗明格指出，她希望这种影响是真实的，但不能排除一些未知的混杂变量。

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But Professor Roth says even the best political leaders cannot unite a country once a society's problems get out of control.

VOA: special.2009.12.19

Man can embody truth but cannot know it."

人可以表现他不理解的真理“

耶鲁公开课 - 现代诗歌课程节选

We cannot do anything about protons, they are buried in the nucleus, but we can add or subtract electrons.

我们不能改变质子，它们埋藏在原子核内，但是我们能够增加或减少电子。

麻省理工公开课 - 固态化学导论课程节选

The options are good for six years but cannot be exercised until year three.

FORBES: Capitalism is contagious

They contributed to government, laborers and lenders, but cannot be measured by the index.

FORBES: Misunderstanding Bill Gross on the Cult of Equity

It has adequate sound quality but cannot compare to the finest digital playback systems.

ENGADGET: HiFiMAN launches HM-901 'high resolution' audio player, we go ears and hands on