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重点讲解：
1. turn to 转变；向...求助
She has nobody she can turn to.
她求助无门。
2. give up 放弃
He is obstinate and determined and will not give up.
他固执、坚决，不会放弃。
3. in due course 在适当的时机
Your request will be dealt with in due course.
你的要求将在适当的时候予以处理。
4. take on a job as 承担...的工作
Why did Maria take on a job as a governess?
玛丽亚为什么要从事家庭教师的工作？
