First we must define an XML document.
首先，我们必须定义一个XML文档。
First, we must define events that will signal the use of this particular content extension.
首先，我们必须定义事件以通知使用这个特殊的内容扩展。
First, we must define our terms.
首先，我们要弄清用词。
Since a network is composed of passive circuit elements, we must first define the electrical characteristics of these elements.
由于一个网络是由各种无源的元件所构成，我们必须先确定这些元件的电特性。
To make use of these coordinates, we must first re-define them in terms of the visible area of the viewing frustum.
了利用好这些坐标，我们首先需根据视图锥截体的可视区重新定义它们。
When discussing the future of British Sign Language we must first define sign language and British Sign Language (BSL).
在讨论英国手语的未来时，我们必须首先定义符号语言和英国手语。
When discussing the future of British sign language we must first define sign language and British sign language (BSL).
当讨论到英国手语的未来，我们必须首先定义手语和英国手语(BSL)。
When discussing the future of British sign language we must first define sign language and British sign language (BSL).
当讨论到英国手语的未来，我们必须首先定义手语和英国手语(BSL)。
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