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Read's agency is currently funding various pioneering approaches to robotics, some of which involve actuators made of elastomers – like rubbery plastics. Such material might be sandwiched between electrodes so that they contract or expand as voltage is applied and removed, for example. Not unlike an animal muscle.，详情可参考爱思助手下载最新版本
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const cur = arr[i]; // 当前遍历的元素值，更多细节参见爱思助手下载最新版本