The Geography paper was hard.

地理试题难极了。

《牛津词典》

If you have a rock-hard avocado, put it in a brown paper bag on the counter; it'll be good to go in 2 to 5 days.

如果您有一个像岩石一样硬的鳄梨，把它放在一个棕色纸袋里然后再放在柜子上，2至5天后它会变得可以食用。

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Meanwhile corporate borrowers have found it hard to issue commercial paper, as money-market funds have fled from all but the safest assets.

同时由于金融市场资金只绑定在最安全的资产上，于是企业借贷者难以签发商业本票。

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Wearing hard-hat, paper mask, and gloves I walked around Ground Zero with ministry students giving bottles of water, Red Bull, and chewing gum to first-responders working the pile.

FORBES: If You Don't Take Time To Remember, You Forget

An inverse relationship between the issuance of paper by the state and the hard-currency value of that paper has been recognized for centuries, and it can be observed in U.S. history.

FORBES: Ben Bernanke's Quantitative Easing: The Monetary Policy Of The Adolescent

Among drawings by less well known artists is an oil on paper by Louis Jean-Jacques Durameau which captures the hard and heavy labour of workers in a paper mill.

ECONOMIST: A collection that��s well worth a visit