I get 之后, 之一, 之前, 之间, 之外. It's when it is used alone when I don't understand why it's used.
“We all agreed on the fact that we refuse to enter any currency war,” the French finance minister, Pierre Moscovici, told reporters at the conference, which was held in a meeting center just a short walk from the Kremlin and Red Square. (cn.nytimes)
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