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重点讲解：
1.flow off流下；断开
In the middle latitudes of the planet's southern hemisphere, water appears to flow off the edges of craters.
在火星南半球的中纬度地区，似乎有水在火山口的边缘流动过。
2.rip off坑骗
The Consumer Federation claims banks are ripping you off by not passing along savings on interest rates...
消费者联盟声称银行在坑骗客户，因为它们没有把从利率上节省下的钱拿来进行反馈。
