厦门的年夜饭市场火爆。这道“龙腾四海小青龙”的龙虾头被固定在盘中，被家人们调侃为“老演员”，还要留给下一桌用。南方周末记者 黄思琪/摄
Today's actuators, even the state-of-the-art ones, are still largely made from metals, hard plastics and electronics. But there are other ideas around. Tolley and his colleagues have been working on a very different approach.
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