學術英文編修
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Phenomenon or Phenomena

One is singular; the other is plural.

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

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.

(Please retain the reference in reprint: http://www.letpub.com/index.php?page=author_education_phenomenon_or_phenomena)