Products disassembly is an important mean to implement the product recycling, and is a necessary step to realize the integrity of the product life cycle.

产品拆卸是实现废旧产品回收再利用的重要手段，是实现产品生命周期完整性与封闭性的必要环节。

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In order to disassembly parts from used products, usually many steps are needed, and disassembling time in each step is stochastic variable.

对废旧产品中的零件进行拆卸通常需要多个步骤才能完成，而每个步骤所需要的拆卸时间都是随机变化的。

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Glass Beads Box: Hand movement in step clutch, gear cycle, rolling sowing, and disassembly design.

玻璃珠箱：手动同步离合器，齿轮转动，滚动撒播，可拆装设计。

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