Variable speed, reversibleaction Load capacity of 100 LBS per sq ft. Retracts for storage Portable, expandable, configurable.
变速，可逆操作载重量为100磅每平方尺缩回存储便携式，可扩展，可配置。
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To implement what Cooper suggests, developers need to make each action that the user performs reversible, which is both costly and in my opinion, not needed.