But in fact, we know very little about the effects of breastfeeding at long durations, because so few women breastfeed for more than a few weeks.

但实际上，在很长一段时间内我们对母乳喂养的影响知之甚少，因为很少有母亲用母乳喂养超过几周的。

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Sleep and dreams have interested people for centuries. Scientists are learning more about sleep, but they still know very little about why we dream.

几个世纪以来，睡觉和做梦都让人着迷。科学家对于睡觉了解了很多，但是他们仍然不清楚为什么人会做梦。

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What do we know about the curious, secretive NSO Group? Very little - but after this week, an awful lot more than we did before.

关于这个令人好奇的、神秘的NSO组织我们所知多少？很少、但这个星期，我们却挖掘出了更多关于该组织可怕的一面。

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Reporters that more often than not know very little about Chinese language and culture.

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It is likely such scrutiny would include auditing by persons who know very little about human capital management, yet would grow more suspicious the more HR had to explain itself.

FORBES: What Will It Take For HR To Gain The Respect That It Wants?