How to correctly pad an object after creation without modifying the class declaration?

如何正确地垫一个对象而不必修改类的声明后的创作？

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AIM: To study the effect of perindopril in treating essential hypertensive (EH) class II accompanied with peripheral arterial disease (PAD).

目的：探索培哚普利对原发性高血压(EH)合并外周动脉病变(PAD)的影响。

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