It means that you must write a letter or telephone to say if you can or cannot come.
它的意思是你必须写信或打电话答复是否会来。
Because this can't be achieved using a built-in validator, you must write a custom validator, as shown in Listing 13.
由于此目的不能通过使用内置验证器实现，所以需要编写一个定制的验证器，如清单13所示。
To test code that accesses hardware, you must write a piece of code that responds in a way similar to the hardware.
为了测试访问硬件的代码，必须编写一段按照与硬件相似的方式做出响应的代码。
Of course, the presence of namespaces in the original XML data affects how you must write such "transformational" queries.
当然，原始XML数据中存在的名称空间将对如何编写那样的 “转换”查询造成一定的影响。
Therefore, you must write the inline custom validation logic as if it were dealing with validation in a custom Validator object.
因此，必须编写嵌入自定义验证逻辑，就像使用一个自定义Validator对象处理验证一样。
The evaluation is the most personal part of an evolutionary algorithm, it is the only part of the library that you must write yourself.
评价函数部分是评价算法中最“个人”的部分，它是库中你必须自己写的一部分。
In addition to these two classes, you must write some glue code that allows GWT to bind the client-side class and the server-side class together.
除了这两个类之外，必须编写一些绑定代码使GWT可以将客户端类和服务器端类绑定在一起。
Collaboration and discussion in doing the homework is very much encouraged, but you must write your own solution, i. e. , do not submit identical solutions!
鼓励同学们互相讨论作业，但最后必须自己完成，千万不可抄袭！
And because both techniques support multiple representations of the same data, you must write and maintain code to generate these representations from the core data.
由于两种技术都支持相同数据的多种表示，因此必须编写和维护用于从核心数据生成这些表示的代码。
If you are using UDDI4J alone, you must write your own code to send out multiple search queries to different UDDI registries and then try to aggregate the data yourself.
如果您是单独使用UDDI4J的，那么您必须自己编写代码向不同的UDDI注册中心发出多个搜索查询，并设法自己聚集数据。
Normally, when building UIs in one technology and services in another, you must write or find a framework that serializes the classes to some format both technologies understand.
通常，用一种技术构建UI，用另一种技术构建服务时，您必需编写或找到一个框架，以两种技术都理解的某种格式序列化这些类。
This usually means that you need to configure your Web server to set this MIME type for a static file, or you must write some code to dynamically create the file and set the MIME type.
通常，这意味着您需要配置您的Web服务器来设置一个静态文件的MIME类型，或者，您必须编写一些代码来动态创建该文件并设置MIME类型。
The disadvantage is lack of flexibility -- you must write a new parser program for each new format, and if a format changes, you must change, recompile, relink, and redeploy the parser program.
缺点在于缺乏灵活性——您必须为每种新的格式编写新的解析器程序，并且如果格式更改，您就必须更改、重新编译、重新链接和重新部署解析器程序。
You must write at least 120 words and base your composition on the following instructions.
写出你对错误的看法并说明理由。
You must write code that avoids overlapping names, so that each widget can be self-contained.
您必须避免编写重名的代码，实现每个小部件都是自含的。
You must write a small amount of code, and you do have limited control over Dynamic Data operations.
必须编写少量代码，而且只能有限地控制动态数据操作。
You must write a small amount of code, and you do have limited control over Dynamic Data operations.
必须编写少量代码，而且只能有限地控制动态数据操作。
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