解析xml文档时，XMLEventReader实例通过它的next方法向客户传递事件对象，文档中的每个语法单位都有一个事件。

When parsing an XML document, an XMLEventReader instance delivers event objects to the client application through its next method — one for each syntactical unit in the document.

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两组不良事件发生率的主要组成事件为需要输两个或以上单位的血液，其在夹合器组为9%，而在外科治疗组为53%。

The main driver of this adverse event rate in both arms of the study was a need for transfusion with two or more units of blood, in 9% of the clip patients and in 53% of the surgery patients.

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两组不良事件发生率的主要组成事件为需要输两个或以上单位的血液，其在夹合器组为9%，而在外科治疗组为53%。

The main driver of this adverse event rate in both arms of the study was a need for transfusion with two or more units of blood, in 9% of the clip patients and in 53% of the surgery patients.

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