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重点讲解：
1. be able to do 可以做...；有能力做...
She was barely able to stand.
她勉强能站立。
2. at one time 曾经；一度
It seems he used to work for the electricity board at one time.
他好像曾经在电力局工作过。
3. have an effect on 对...有影响
Does television have an effect on children's behaviour?
电视对孩子的行为有影响吗？
4. In the long term 从长远来看
Organic fertilizers will have very positive results in the long term.
有机肥料从长远来看将产生非常积极的效果。
