Today's Sentence
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This cave painting, which dates back to 30,000 BC, may represent the earliest observation of the phenomenon.
Key Vocabulary
1. represent
represent
[ˌrep.rɪˈzent] (v.)
2. observation
observation
[ˌɑːb.zɚˈveɪ.ʃən] (n.)
3. phenomenon
phenomenon
[fəˈnɑː.mə.nɑːn] (n.)
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