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重点讲解：
1. be due to 由于；因为；
Most of the problems were due to human error.
多数问题都是人为错误造成的。
2. pick up 好转，改善；
Industrial production is beginning to pick up.
工业生产开始好转。
3. slow down (使)放慢；(使)减速；
The threat of global warming will eventually force the US to slow down its energy consumption.
全球变暖的威胁将最终迫使美国减缓能源消耗。
4. bring in 引入；请来；邀请；
The firm decided to bring in a new management team.
该公司决定聘请新的管理团队。
