main subject例句

Mathematics is a main subject in middle schools.
数学是中学的一门主科.

Medical microbiology is a main subject of basic medicine.
医学微生物学是医学生的专业基础必修课.

Female initiation themes is the main subject in novels of Atwood.
女性成长主题是贯穿阿特伍德小说的一条主线.