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重点讲解：
1. self-study 自习；自我学习；
Second, self-study is a process to develop our ability of thinking and management.
其次，自学是培养我们思维能力和管理能力的一个过程。
2. at once 马上；立即；
I must be going back at once.
我得马上回去。
3. be divided into 被分为；被划分为；
The physical benefits of exercise can be divided into three factors.
运动对身体的好处可以分为3个方面。
4. take time 花费时间；花时间；
We will restore her to health but it may take time.
我们会让她恢复健康，但可能需要一些时间。
