为何要使用CSS ？
为何要使用电脑控制振动仿形切割设备?。
Why use computer-controlled cutting equipment vibrating blade profile?
我们为何要使用与分类例子中相同的数据集呢？
Why are we using the same data set we used in the classification example?
但除了一件事情，你还没有明白为何要使用四元数的原因。
Except for one thing: you don't have a good reason to use quaternions yet.
首先来看看我们为何要使用依赖注入，它能带来什么好处。考虑下列代码。
First, let's explore why dependency injection is beneficial. Consider the following class and method.
我们为何要使用他们那些过于复杂的模式、长得没有必要的元素名、含糊的实体名或者傻里傻气的模式声明语言结构？
Why should we have to use their overly-complex schemas, their stupidly-long element names, their cryptic entity names, or their simply-stupid schema declaration language structures?
XSLT是什么类型的语言？ （MichaelKay，developerWorks，2005 年4 月）：了解 XSLT 的来历、擅长方面以及为何要使用它。
What kind of language is XSLT (Michael Kay, developerWorks, April 2005): Put XSLT in context as you learn where the language comes from, what it's good at, and why you should use it.
如果要使用一种XML解析API，为何还要构造对象模型呢？
Why would you want to construct an object model if you intend to use one of the XML parsing APIs?
但是，为何组织之间需要使用一种统一的标准呢？
But, why is a standard to be used consistently across organizations needed?
本文描述了消息组的概念以及为何需要使用消息组的原因。
This article has described what messages groups are and why you might want to use them.
客户很多时候会问，他们为何需要使用ClaimCheck模式且何时使用它。
Many times, customers will ask why they need to use the Claim Check pattern and when to use it.
为何需要使用工业照相机？
为何人类需要使用另类能源?。
为何人类需要使用另类能源?。
应用推荐