subject可以是专业吗？
可以的，但比较少用。 Subject作名词有“话题”、“主题”的意思，可指“某门学科”，相当于major或specialty。 比如： She has just chosen her subject for her postgraduate studies. 她刚刚决定研究生就读的专业。 I'm not very good at subjects with numbers in them. 我不是很擅长带数字的科目。 You need to choose your subject carefully as this will determine what you do for the next three to four years of your life. 你需要慎重选择你的专业，因为这会决定你今后三四年里要做什么。
但是，如果谈论具体的主课（即具体某一学科的若干课程的总称）时，通常不用subject而用course。 比如： The course consists of six modules， including two lectures and a presentation every week. 这个课程由6个模块组成，包括每周2次讲座和一次演示。 All our courses are designed around themes that matter to you. 我们所有专业的课程设置都以对你很重要的主题来设计。