Objective to investigate causes, change of pathogenic microorganism, clinical vicissitudes and prognosis in infective endocarditis (IE) to improve the diagnosis and treatment of IE.

目的探讨感染性心内膜炎(IE)的病因、致病微生物的变化、临床变迁及预后等因素，提高IE的诊治水平。

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The goals of the vicissitudes of tax system of China gradually change, but its immovability is coercion and expediency.

在中国的税制变迁中，不断变化的目标背后相同的变迁理念是强制和权宜。

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That floating voice regardless dust how of pile up, regardless vicissitudes of life how of change, also still clear.

那悠扬的声音无论尘土怎样的堆积，无论沧桑怎么的变迁，也依旧清晰。

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