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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).
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16. Do you have to pay to sign up for an affiliate program? To build your affiliate marketing business, you don't have to invest money in the beginning. You can sign up for free with any affiliate network and start promoting their brands right away.，更多细节参见搜狗输入法2026
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