One is singular; the other is plural.

一个（Phenomenon）是单数，另外一个（Phenomena）是复数。

Phenomenon comes to English from Greek through Latin—kind of like criterion, which came directly from Greek.

Phenomenon来源于拉丁语，后从希腊来到英国，这种情况有点像criterion，直接来自希腊。

Singular

Phenomenon
Criterion

Plural

Phenomena
Criteria

Quick and Dirty Tip: Remember that phenomenon is singular by noting that the non at the end sounds like one.

应急提示：可以通过该单词的末尾non有点像one这一点来记住phenomenon是单数。

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