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第二百五十二条 保险责任开始前，被保险人可以要求解除合同，但是应当向保险人支付手续费，保险人应当退还保险费。
。safew官方版本下载对此有专业解读
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In most cases, it’s as simple as making sure that types, interfaces, classes, methods and functions that should not be used outside of the module have internal or private access scope. The compiler (or interpreter) will make sure that users won’t break encapsulation. Alternatively, for small and medium modules, you can prepare a facade object that will be used as an entrypoint to the module.