1. It can refer to an academic subject or a practical skill. 
   这一词既可指某一学科也可指某种技能。
2. dealing with a subject in the abstract without practical purpose or intention. 
   抽象的对待某学科，没有实际的目的或者意图。
3. of or relating to a practical subject that is organized according to scientific principles. 
   属于或关于依照科学原理组织起来的实用学科。
4. ON the subject of the marketing, I don't think John's idea is practical. 
   说到销售，我认为约翰的主意不实际。
5. Although he knows this subject very well , he is not good at using it to solve practical problems. 
   虽然他对这门学科非常熟悉，但他却不善于应用它去解决实际问题。

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• 1. 实用学科
  {n.}政治主体 practical subject...实用学科 prediction of subject of crime...{n.}犯罪主体预测 preparatory subject
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• 2. 实用科目
  practical skill 实用技能...practical subject 实用科目...practical teaching 教学实习
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