但实践表明，学生函数概念掌握的水平较低，函数概念仍是学生数学学习中理解较困难的概念之一。

However, in practice, the level that students grasp the function conception is lower, and students feel difficult in learning it.

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但实践表明，学生函数概念掌握的水平较低，函数概念仍是学生数学学习中理解较困难的概念之一。

However, practice shows that students 'ability to grasp the function conception is quite poor, it is till one of the tough conceptions in students 'mathematics studying.

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他无法掌握数学的基本概念。

He can't grasp the basic concepts of mathematics.

《牛津词典》

If the student hasn't mastered the basic concept, we will make sure that the grade scheme gives a failing grade.

如果学生没有掌握基本的概念，我们会确保,成绩将会不及格。

麻省理工公开课 - 固态化学导论课程节选

It's a little... I think that concept is a little bit easier to grasp. It's like a definite rule, and

不过这个有点……我认为这个概念掌握起来稍微容易点。因为有明确的规则，而且是

韩国人经常犯的失误 - SpeakingMax英语口语达人

So, if you propagate that through the whole year, and you have the basic mastery of the concepts, 50 is a pass.

如果你一整年都在认真学，那你就可以掌握基本的概念,50分就可以通过。

麻省理工公开课 - 固态化学导论课程节选