My friend thanked him, left the office with the useful knowledge that his boss was an antiquated buffoon, and soon had a top job at a rival company.

我朋友谢过了他，从中学到了一条非常有用的知识：他的老板是一个愚蠢守旧的老古董。他辞了这份工作，很快在另一家竞争对手那儿找到了高级职位。

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They underline the fact that every subject has its own importance and pupils will absorb knowledge useful for their future.

他们强调每个学科都有其重要性，而学生会吸收对自己未来有用的知识。

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But the user's ultimate goal is to obtain useful knowledge.

但是用户最终的目标是获取有用的知识。

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Then one day Luisa, who knows the strangest and most insignificant things and is always surprising me with scraps of useful knowledge, passed me her straw hat and advised me to look through the gaps.

NEWYORKER: While the Women Are Sleeping

The process of designing and manufacturing the Pixel will have taught Google a lot about the hardware business - and with products like Google Glass on the horizon, that knowledge could prove very useful.

BBC: Who'll pay for a Pixel?

When not prescribing purges and pills to his sickly employer and his friends, Sloane crisscrossed the island on horseback or on foot, collecting plant and shrub specimens, guided by slaves from the sugar plantations with knowledge of local medically useful seeds and grasses.

BBC: All that glisters can be gold