"Enroll in a course" 是参加课程的常用英文表达方式。
这个表达方式的来源可以追溯到英语中的动词"enroll"，它有登记、注册的意思。
例句：
I want to enroll in a cooking class this semester. (我想在这学期参加一个烹饪课程。)
Have you enrolled in the photography course yet? (你已经参加了摄影课程吗？)
I enrolled in a yoga class to improve my physical and mental well-being. (我参加了瑜伽课以提高我的身体和精神健康。)