An extraordinarily important study skill is knowing how to mark a book.

知道如何在书上做标记是一个非常重要的学习技巧。

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Ideally, knowing, say, what sort of resin Mark Rothko used or which pigments are in a medieval manuscript can help determine the best ways to preserve the objects.

理论上说，知道马克·罗斯科（油画家）使用哪种松脂或中世纪一份手手稿上是哪类颜料，都有助于找出保存这些作品的最佳方法。

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You may be able to keep all the knowledge in your head, but knowing when to apply which rules is the mark of a true professional.

也许你可以把书本上的一切知识都装入脑中，但知道在何时应用何种规则，这才是真正高手的标志。

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So, kudos to Mark Zuckerberg for being bold and knowing a good thing when he saw it in Instagram.

FORBES: Here's My Fix for Facebook: Make Facebook a Subsidiary of Instagram With Zuck Reporting to Systrom

But knowing that trust has become precious and the ability to deliver it, as Mark Twain once said, is like the difference between lightning and a lightning bug.

FORBES: The of Power Of Trust

His parents Mark Williams and Joanne Parker say they "can't rest" without knowing how their son died.

BBC: Marc Williams death: Family appeal for information