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重点讲解：
1. result from 由…产生；由…引起；
The discrepancies resulted from different methods of computation.
这些差异是由不同的计算方法造成的。
2. a variety of 各式各样；多种多样；
He resigned for a variety of reasons.
他由于种种原因辞职了。
3. be set to do sth. 做好准备的；可能的；
The budgetary arithmetic suggests that government borrowing is set to surge.
预算数字表明政府借款将要大幅增加。
4. be good for （对…）有用，有好处；
It's probably good for you to get some criticism now and then.
偶尔受点批评或许对你还有好处。
