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重点讲解：
1. be responsible for 负有责任的；应承担责任的；
Cigarette smoking is responsible for about 90% of deaths from lung cancer.
因患肺癌而死亡者，约90%是吸烟所致。
2. make up 组成；构成；
Women officers make up 13 per cent of the police force.
女警占警力的13%。
3. on record 有记录的；有记载的；
Last summer was the wettest on record.
去年夏天是有记录以来降雨量最大的。
4. as usual （尤指其他事情有变化时）照常；
She was getting breakfast as usual.
她像往常一样在准备早餐。
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