It soon proved uneconomical to stay open 24 hours a day.

每天24小时营业很快就证明是不经济的。

《牛津词典》

There two rich brothers, Oliver and Roderick, gave him a letter and told him not to open it until two o'clock of the day.

在那里，两个富有的兄弟，奥利弗和罗德里克，给了他一封信，并告诉他在当天两点之前不要打开它。

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He wanted to open the store, but he thought that it would serve these rude customers right if he went home and didn't open the store at all that day!

他想打开店门，但觉得如果他转头回家，一整天都不开门，才是这些无礼的顾客应得的。

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It was a tradition to open the White House on that day so the president could wish visitors a happy new year.

VOA: special.2009.10.08

These partnerships shouldn't be entered into lightly, warns Jamie Pedersen, a Washington state rep who pushed the registry and signed up for it with his partner, Eric Pedersen, the first day it was open in July.

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Unlike other European public transit systems, it stays open 24 hours a day, seven days a week.

BBC: Subway systems by the numbers

Some visitors use it as a base for hiking or heli-skiing (it's open only for day trips in winter), while many do nothing more strenuous than taking photos or reading on the deck, rousing themselves only for another estimable lunch.

FORBES: Lifestyle Feature