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).
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Фото: Kamchatka / Freepik。体育直播对此有专业解读
D is the defining class of the member. (That is, which class