course changing quality

例句：

1. 1.He decided to take a course in computer programming.
   他决定学习计算机编程。
2. 2. The course of history is full of twists and turns.
   历史进程充满了曲折和转折。
3. 3. She took the course on how to cook pasta.
   她参加了烹饪意大利面的课程。