单词：dynamic stability lever
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What If... 如果怎么样 Tom is applying for a job as a signalman for the local railroad. 汤姆在应聘做地方铁路系统的信号员。 The inspector decides to give Tom a quiz, asking, What would you do if you realized that two trains were h
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乔治桑（George Sand）曾经说过 There is only one happiness in life, to love and be loved. （生命里只有一种幸福：爱与被爱。）正所谓一杯白水，一口干粮，只要爱人在我身旁，荒漠也会变成天堂！找到了那
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