在城市化和房地产的浪潮中，我们似乎都在奔向一个更广阔的世界。但我已经在这里，见过世界最好的模样。
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This latest escalation comes days after Pakistan carried out air strikes inside Afghanistan following suicide blasts on its soil (file photo)
"For a long time, roboticists have used DC [direct current] motors to make robots move," says Mike Tolley at the University of California San Diego.