The long and thin bricks cover the upper four floors, which are equally into flats and office space.

长条砖覆盖了上面的四层，均分到公寓和办公空间。

youdao

Portable wooden stairs connected its four stories and if the village came under attack, residents could take refuge, pulling the stairs up behind them and firing at the enemy from the upper Windows.

便于拆卸的木质台阶四层楼，如果村子遇到了袭击，村民可以到这里庇护，把台阶拉上去，并且在楼上的窗口向敌人开枪。

youdao

It is not known exactly how much oil has leaked into the sea, but if an upper estimate of over four million barrels is confirmed, the disaster would be the biggest accidental oil spill ever.

尽管不知道具体多少石油泄漏，但是如果一项超过四百万桶的高级估测被确认的话，这将是史上最严重的漏油事故。

youdao

The first building will feature about 17, 000 square feet of ground-floor space for businesses like cafes, delis and banks and 91 rental units on the upper four stories, with apartments designated for residents of various incomes.

WSJ: Wyandanch Rising Tries to Undo Long Fall

Rajaa Alsanea's novel, set in the form of a gossipy internet blog about four upper-middle-class Saudi girls and their calamitous love lives, was officially banned in Saudi Arabia when it was published in Arabic two years ago (and a lawsuit was briefly filed against the author, fortunately away in America studying dentistry).

ECONOMIST: Saudi fiction

The internet was built on version 4 of the Internet Protocol (IPv4) which has an upper limit of about four billion addresses.

BBC: Net approaches address exhaustion