How has such a phenomenon occurred?

这种现象是怎么产生的呢？

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Months later, on January 25, 1825, the same phenomenon occurred again.

几个月之后，在1825年一月25日，同样的现象再一次出现。

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Inflation is a social phenomenon occurred in a society of commodity economy.

通货膨胀是商品经济社会发生的社会现象。

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In 2011, this phenomenon occurred several times.

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It can be argued this phenomenon has occurred for the past 10 years, on a longer-term basis, but it has become more pronounced in recent months.

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This is not the first time this phenomenon has occurred.

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