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science (inc. mathematics, medicine, etc.); natural science
science department (university); science course
science (as a school subject)
子供の頃から理科の実験が大好きだったんだ。
I've loved science experiments since I was a child.
理科の授業で面白い実験を見せてもらったよ。
I got shown an interesting experiment in science class.
理科と数学が得意な生徒は理系に進むことが多い。
Students good at science and math often go into sciences.