大约只有一半的课程是由具有数学学位的老师教授的。
Only half of the lessons were taught by someone with a maths degree.
数学语言是一种由记号和符号所构成的语言。
传统规范语言的劣势在于，它们是由拥有稳固数学知识的人员使用的，使用它来建模系统很困难。
The disadvantage of the traditional formal languages is that they are used by people who possess a solid mathematical knowledge, but they are difficult to use for a modeling system.
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