A common theory for this unusual phenomenon is that the lemmings do not realize that the ocean is such a huge body of water.

对于这种不寻常的现象，一个普遍的理论是，旅鼠没有意识到海洋是如此巨大的一片水域。

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This is a rather common phenomenon within the Tetrapoda.

这在四足纲动物中是相当普遍的现象。

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This phenomenon is so common in the psychological literature (and in life) that I coined a term for it-frustration attraction.

这种现象在很多心理学的文学作品里(或者生活中)极其常见。我给它们取名为-吸引力的挫败。

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"This is a common phenomenon, and it's definitely a field for anticorruption work, " says Li Chengyan, director of Peking University's Research Center for Government Integrity.

WSJ: Chinese Officials Ousted Over Alleged Sexual Exploits

But killing... in huge numbers like this, is not a common phenomenon.

BBC: Pirates 'kill fishermen' off Bangladesh