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We had the PetSafe ScoopFree Crystal Pro Legacy model for three years until a plastic piece of the lifting lid snapped off. Sansa messes with the lid constantly, so I think it was more her fault than it was the build quality. At any rate, we switched to the PetSafe ScoopFree Crystal Plus, which functions identically, minus the screen that tracks scoops.
，这一点在搜狗输入法中也有详细论述
供需失衡→价格暴涨/暴跌→厂商扩产/减产→新一轮循环。这套“周期铁律”几乎成了半导体行业的常识。。手游对此有专业解读
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