beaten their brains

• v. 绞脑汁(苦干)

beaten their brains的用法和样例：

例句

1. Some students are lazy, but others beat their brains out and succeed.
   有的学生懒惰。但有的学生则苦思有成。
2. Some students are lazy, but others beat their brains and succeed.
   有些学生很懒惰; 另一些则勤动脑筋，因而学有所成。