Medical imaging is a main subject in current clinical medicine.(醫學影像學是當前臨床醫學中的一個重要學科。)

Use Shallow Depth-of-Field Isolate a centerpiece or other main subject with a shallow depth of field.(使用淺景深能分離餐桌擺飾和其它主體。)

Pathology is a main subject of medicine.(病理學是醫學專業的主干學科。)

Your major is the main subject you choose to study in college.(你的專業是你在大學選擇的主要學科。)

What tis the main subject of this writing?(這個作品的主題是什么?。)

Canon's E-TTL II even measures the distance to the main subject and that also becomes part of the evaluation taking place.(佳能的E-TTLII甚至可以測出相機和主要被攝對象間的距離并將此作為測光的考慮因素之一。)

Main subject: material science and engineering.(主干學科：材料科學與工程。)

And competitive superiorities are the main subject of strategic management.(而競爭優勢又是企業戰略管理的主題。)

That poor ant is the main subject of our radio story.(可憐的螞蟻是我們廣播故事的主要人物。)

Further detailed information on normalization can be found in most books whose main subject is relational databases.(在大多數以關系數據庫為主題的書籍當中，都可以找到關于規范化的更詳細的信息。)