科研之友
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摘要
<正>A motorist was bogged down(陷于泥沼) in a muddy road. He paid a passing farmer fifty dollars to pull him out with his tractor.After he was back on dry ground he said to the farmer,"At those prices, I think you can pull people out of the mud night and day.""I can’ t," replied the farmer."At night I haul water for the road."
