But rock art also has a practical value for researchers and let's start by considering why that is.

但岩石艺术对研究人员来说也有实用价值，让我们先来看看为什么会那样。

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To leave our planet nothing but rock and dust.

除了岩石和尘土外不在我们的星球留下任何东西。

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Anyone can go hiking, but rock climbing really separates the men from the boys.

谁都能去徒步旅行，但是攀岩才能真正考验人的体能。

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But activities that some schools offer now, like rock climbing walls and skateboarding, can also expand the risks, says Cheryl Richardson.

VOA: special.2009.08.06

This may sound a little bit too much, but I'm no different than that animal, than that tree, than that rock.

这也许一下子很难接受，但我与各种动物没有不同，也与树木，岩石无异。

普林斯顿公开课 - 人性课程节选

I like some rock, I like some electronic, but

我喜欢摇滚乐，也喜欢电子乐，但是

看表演很好 - SpeakingMax英语口语达人

Falling prices may discourage people from opening their wallets, but rock-bottom prices also encourage spending.

ECONOMIST: Japan��s economy

There are not only lower labour costs but rock bottom labour costs.

BBC: What does the future hold for American manufacturing?

But rock 'n' roll is fundamentally a reflection of the American experience.

NPR: Vieux Farka Toure, Justin Adams & Juldeh Camara: Rock 'N' Roll Goes To West Africa