Wagon trains — groups of wagons — rode in four lines across the land when they passed through dangerous country. If attacked, the wagons could quickly form a circle for defense.

马车队(即一群马车)，当他们经过危险区时，他们排成四排向前行进，如果遭受到攻击时，这些马车就会很快地形成一个保护圈进行抵抗。

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It also doesn’t help that here above the Arctic Circle we were getting only about four hours of dusklike sunlight a day.

这儿是北极圈以北的地区，一天当中大约只有四个小时暮气沉沉的阳光，对游客不甚方便。

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The idea is to circle the globe in five stages, each taking four or five days of continuous flight (which is about as much as a pilot could endure).

这个环球飞行计划分为五个阶段，每个阶段用时四到五天（这也是一个飞行员所能忍受的极限了）。

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Below that is a row of four test tubes, marked with a circle, an X, a square and a plus sign.

FORBES: Magazine Article

With four pods arranged in a circle, the Harmony node becomes one of the station's safe havens.

BBC: A space of one's own

Four buttons arrayed in a circle bring up the command menu, play and pause songs, and shift forward and back.

FORBES: IPod's A Winner