他头几年里致力于研究数学;后来他又去研究自然科学;但最后他又回过头来重操旧业,研究数学。 He devoted the first years of his student lift to mathematics then he studied the natural science; but finally returned to his first love.
我们极力让他学习自然科学。 We pushed him hard to take up science.
你在学校里学自然科学吗? Do you do science at school?
我喜爱自然科学,不喜欢人文科学。 I prefer science to the humanities.