学生初次接触到负数的概念时，对理解负数的意义及有理数的运算法则都会产生困难。
When first meet negative numbers, students have difficulty understanding both the meaning of negative numbers and the rules of operation between rational numbers.
他在那里通过卖巧克力块而其它狱友而赚了一些小钱，也是在那个时候在1991年特纳与蒂娜初次接触到摇滚殿堂。
He was there, making a small fortune out of selling on chocolate bars to other inmates, when he and Tina were inducted into the Rock 'n' Roll Hall of Fame in 1991.
他在那里通过卖巧克力块而其它狱友而赚了一些小钱，也是在那个时候在1991年特纳与蒂娜初次接触到摇滚殿堂。
He was there, making a small fortune out of selling on chocolate bars to other inmates, when he and Tina were inducted into the Rock 'n' Roll Hall of Fame in 1991.
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