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重点讲解：
1. up to 高达；多达；
You could be disqualified from driving for up to three years.
你可能会被取消驾驶资格达三年之久。
2. come from 来自；
About 65 per cent of its sales come from abroad.
大约65%的销量来自国外。
3. be related to 相关；有关联；
The llama is related to the camel.
美洲驼和骆驼是近亲物种。
4. be free of 无…的；摆脱了…的；
In remote regions, the air is pure and the crops are free of poisonous insecticides.
在偏远地区，空气很纯净，庄稼也不施用有毒的杀虫剂。
adj. 温和的，适度的，有节制的
