Many species are similar enough that hybrid offspring are possible and may often occur in nature, but for the majority of species, this rule generally holds.

许多物种非常相似，因此有可能杂交繁衍出后代，而且这种情况可能经常在自然界中发生；但对于大多数物种来说，这一规则大体适用。

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In concrete construction, quality defects may often occur. The causes of some common defects and control of them are discussed.

混凝土工程施工时，经常发生一些质量问题，文章就从质量通病的产生原因和防治方面进行了一些探讨。

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An episode of major depression may occur only once in a person's lifetime, but more often, it recurs throughout a person's life.

重度抑郁发作可能在一个人的一生中仅出现一次，但更经常的是，它在一个人的一生中反复出现。

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Meanwhile, May is a month when many weddings occur in India, where gold is often bought as a gift.

FORBES: FOCUS: Analysts: Physical Market Watching To See If Gold Price Stabilizes

In order to avoid this tax implication, investors often exit their positions before a year, which diminishes their ability to profit from any multiyear gains that may occur in gold.

FORBES: The Gold Showdown: ETFs Vs. Futures