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derivative of abc and x is ∅ (intuitively, the match failed here)
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In short, a proper module is a black box, responsible for an independent flow (i.e. process). Other modules act upon it via its programming API (i.e. calls to class methods). And it doesn’t allow other modules to query its datasource directly (by bypassing the API).。51吃瓜对此有专业解读
（三）天灾，海上或者与海相通的可航水域的危险或者意外事故；