单词：ultracentrifugation method
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我上个月坐火车到纽约去看朋友，上车后刚要坐下，旁边座位上的女乘客就开始很大声的自言自语，看上去精神好像不太正常，吓得我只好在过道对面远远地坐下。 后来我注意到，每次有人要
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Health Report - Does a Birth Control Method Raise HIV Risk? 健康报道 - 避孕药物是否真会增加艾滋病毒感染风险？ This is the VOA Special English Health Report. 这里是美国之音慢速英语健康报道。 The World Health Orga
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Traditional Teaching Method Do your teachers still use traditional techniques to teach you nowadays? A revol- ution in teaching techniques is required now. In the past, we just took it for granted that a teacher' s aim was to teach the students all t
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