1. 他頭幾年里致力于研究數學；后來他又去研究自然科學；但最后他又回過頭來重操舊業(yè)，研究數學。
   He devoted the first years of his student lift to mathematics then he studied the natural science; but finally returned to his first love.
2. 我們極力讓他學習自然科學。
   We pushed him hard to take up science.
3. 你在學校里學自然科學嗎？
   Do you do science at school?
4. 我喜愛自然科學，不喜歡人文科學。
   I prefer science to the humanities.

自然的英語翻譯：

科學的英語翻譯：