We need to get down to the serious business of working out costs.

我们该认真地把成本算出来了。

《牛津词典》

Over the past few months, it has been working hard, with the help of media consultants, to play down its cosy reputation in favour of something more academic and serious.

在过去的几个月里，在媒体顾问的帮助下，它一直在努力工作，以淡化其轻松愉快的印象，打造更学术化、更严肃的形象。

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Since the early 1970s, historians have begun to devote serious attention to the working class in the United States.

20世纪70年代初以来，历史学家开始认真关注美国的工人阶级。

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But she was very serious, very motivated, very hard working type of person and really a kind of good Catholic girl her entire life.

VOA: special.2010.03.08

The men, aged 32 and 29, were taken into custody, accused of working with a serious organised crime group.

BBC: Polcie raid

So, Ultrabooks really range from highly portable units to serious working notebooks.

FORBES: Ultrabooks: Parade Of Beauties At The Consumer Electronics Show

He pumps iron, and spews invective, while working out at Serious Strength, a gym for the swells on the Upper West Side of Manhattan.

FORBES: Magazine Article