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》

A lot of students want to work then, so it is really rare for us to have an open spot at that time of day.

很多学生都想在那个时候工作，所以我们很少在那个时候有空位。

youdao

It was a bright day, and the sun shone through the open Windows.

那天阳光明媚，透过开着的窗子熠熠闪光。

youdao

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.

FORBES: On The Cover/Top Stories

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