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重点讲解：
1. in an effort to 努力想；试图要
The company has laid off 150 workers in an effort to save money.
公司为节省资金遣散了150名工作人员。
2. keep up with 赶得上；和...保持联系
She did not bother to keep up with the news.
她不愿操心去了解新闻。
3. free up 空出来；腾出来
The government has promised to free up more resources for education.
政府保证调拨更多资源用于教育。
4. In addition to 除了...之外
In addition to headaches, you may develop stomach ulcers as well.
除了头痛，你还可能患上胃溃疡。
