Or Serves As An的意思|示意

A memorial is an object which serves as a focus for memory of something, usually a person (who has died) or an event.

这个已经说得很明显了，名词为一种纪念碑(纪念去世的人、活动)。

DOMDocument class: Check out the PHP Manual entry for this class, which represents an entire HTML or XML document and serves as the root of the document tree.

DOMDocument 类：查阅有关这个类的 PHP Manual 项，这个类代表了整个 HTML 或 XML 文档并充当文档树的根。

A layout for an exhaust pipe which also serves as a drainage pipe which prevents splashing of water generated in a fuel cell toward a passenger or splashing toward a tire.

提供一种具有排水构造的燃料电池摩托车，其研究将由燃料电池生 成的水向车身外排出的排水口的设计，使水不会飞溅到车轮或乘员的脚 等上。

A device, such as a ruler, TAB, or bar, that serves as an indicator or ACTS to regulate a motion or operation.

导向装置用作指向物或用来调整运动方向或运行的装置，如尺子、调整片或栅栏。

A doctorate in education often serves as the foundation of an administrative career at a college or university.

教育界中，拥有博士学位的人往往在各大院校都是担任管理者的职位。

This second practice also serves as an opportunity for them to mitigate the risk of being perceived as nit picking or picking a battle just to pick a battle.

第二项实践对他们来说也是一个机会来降低被感觉到的找茬儿或者仅仅为了挑毛病而吹毛求疵的风险。