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重点讲解：
1. be free of 无…的；摆脱了…的；
She retains her slim figure and is free of wrinkles.
她保持着苗条的身材，脸上也没有皱纹。
2. right away 立刻；立即；马上；
Mick wants to see you in his office right away.
米克要你马上去他的办公室见他。
3. on the line 岌岌可危；冒极大的险；
He wouldn't put his career on the line to help a friend.
他不会为了帮助朋友而让自己的事业受到威胁。
4. be interested in 感兴趣的；有兴趣的；关心的；
As a writer I am interested in characterization.
作为作家，我对人物塑造感兴趣。
