Topic: Noun
/ˈtɒp.ɪk/ US /ˈtɑː.pɪk/ noun [C]
a subject which is discussed, written about or studied:
Our discussion ranged over various topics, such as acid rain and the hole in the ozone layer.
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Could you imagine, Every 4-year-old child ask 400 questions every days?
That is astonishing!