... 他们给玛丽买了礼物 » They bought a gift to Mary 他们正在拍一些照片 » They take some pictures 初三史、地办 » Third-year history, to do ...
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...我每次回家都很晚 » Every time I come home late at night all 他们正在拍一些照片 » They are taking some photographs 揭示了静力学特征及动力学特征， » Reveals the characteristics of statics and dynamics, ..
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