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重点讲解：
1. hunt for 搜寻
The couple had helped in the hunt for the toddlers.
这对夫妇曾帮着寻找那些蹒跚学步的孩子。
2. a lack of 缺乏
There is a lack of knowledge about the tax system.
大家对税制缺乏了解。
3. push up 增加；提高
Any shortage could push up grain prices.
任何短缺都会推动粮价上涨。
4. deal with 处理；应对
She had shown herself unable to deal with money.
她所做的事已表明她不善理财。
