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。
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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