// ⚠️ 易错点3：此处返回n而非0（完全有序无需排序，长度为0）
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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.