She tried extra hard.

她特别努力。

《牛津词典》

To avoid disenchantment, India will need to work extra hard to get support from investors at home and abroad, and to deliver on past promises.

为避免令人们失望，印度将需额外努力以获得国内外投资者的支持，并兑现以往的承诺。

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It is often hard for them to find food, so some animals such as mice collect extra food before winter and hide it.

它们通常很难觅食，所以一些动物会在冬天来临前收集额外的食物并储藏起来，例如老鼠。

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Pfizer can be expected to engage in a pitched marketing battle against any competition, perhaps arguing that lowering bad cholesterol with statins has extra, hard-to-measure benefits that doing so with Zetia does not.

FORBES: Merck And Schering's Big Day

So parents give their children an extra banana or hard-boiled egg.

ECONOMIST: Cubans stand by for a long, hot summer

Further, says Peabody, world steel production is up 8% this year, requiring an added 75 million tons of extra hard and hot-burning metallurgical coal.

FORBES: Peabody Earnings Up, Coal Supercycle Just Beginning