The rich are not a class yet because there is still very high mobility both up and down.
富人不是一个阶层，因为还存在频率很高的上下迁移。
There are some problems existing the teaching archives because of the high mobility of teachers and students, and the old fashioned facilities of instructional Hospital.
由于临床教学医院的教师与学生流动性大、教学办公设施落后等条件限制，使教学档案管理存在着一些问题。
Multilegged walking robots have been generating a considerable interest, because of their high performances in various robotic tasks and their great mobility and adaptability to the rough terrain.
多足步行机器人具有较强的机动性和适应不平地面的能力，能完成多种机器人工作，已激发广大研究人员的研究兴趣，其研究具有重要的科学意义和实际应用价值。
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