A teacher deserves wide latitude in selecting the method of grading that best promotes learning in her classroom; that is, after all, the primefunction of grades.
在选择最能促进课堂学习的评分方法时，教师应具有很大的自由度；毕竟，这是成绩的主要用途。
2
Communication is the primefunction of language.
交际是语言的主要功能。
3
The primefunction of schooling should be to equip the future generation to find jobs.