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The study of science is plainly known as science.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
それは科学の本ですよ。
It's a science book.
大人でも科学をきちんと分かってる人は少ない。
There are not many adults who have a proper understanding of science.
次回の科学のクラスまでに、川に行って下さい。
Please go to a river by the next science class.
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