1. Though researchers have invent many kinds of wheeled machine, designing and manufacturing a legged robot like myriapod running in natural environment is still a huge challenge.
因此，设计和制造一个类似动物能够在自然环境中步行的机器，一直以来是人类追求的目标。
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2. Though researchers have invent many kinds of wheeled machine, designing and manufacturing a legged robot like myriapod running in natural environment is still a huge challenge.
