图片不是必需的，但带有创意图片的故事将获得额外的加分。
Pictures are not necessary but stories with creative pictures will get extra points.
诚然，高中编程课对于在大学学习计算机科学来说并不是必需的。
It's true that high-school coding classes aren't essential for learning computer science in college.
在这种情况下，XML模式不是必需的。
另外还需要了解MVC，但这不是必需的。
基本了解WSDL会有帮助，但不是必需的。
源验证不是必需的，报告是有效且正在运行的报告。
Source validation is not required, the reports are valid and running reports.
可以输入一个密码以提高安全性，但这不是必需的。
Optionally, you can enter a passphrase for increased security, but it isn't required.
此插件不是必需的，不过它的确使得工作区更为友好。
In is not required, but it does give you a more friendly workspace.
如果给定的服务不是必需的，则可以禁用其侦听端口。
If a given service is not required, then you can disable its listening ports. Looking at this list, potential candidates for disabling are.
连接组并不是必需的，但是有助于组织相关的连接配置。
Connection groups are not required, but they are useful for organizing related connection configurations.
布局代码中的窗口一侧的便捷工具不是必需的。
Marginal convenience in your layout code is not a necessity.
这是使您的代码更加灵活的最佳做法，但不是必需的做法。
This is a best practice that makes your code more flexible, but it is not necessary.
由于不需要子菜单结构，因此菜单组件的菜单不是必需的。
Since we do not need a submenu structure, a menu for the menu contribution is not required.
会话功能不会被轻易地提供，因为阐明基本模式不是必需的。
Session support will not be enabled simply because it is not necessary to illustrate the fundamentals of the pattern.
该选项不是必需的，如果未指定，则filter用作缺省表。
This option is not necessary and, if not specified, the filter is the default table to be used.
Simon(1947)提出，完美效率的概念并不是必需的。
Simon (1947) argues that the concept of perfect efficiency is not required.
如果你熟悉意图显现和冥想将会对你很有帮且，但那不是必需的。
If you're familiar with intention manifestation and meditation it will help greatly, but it's not required.
如果这不是必需的，则可以使用创建流程实例的通用EJB接口。
If this is not required, the generic EJB Interface to create process instances can be used.
注意，清单7 所示的缩进仅仅为了增加可读性，不是必需的。
Note that the indention shown in Listing 7 is there only for readability and is not required.
本文中的示例类还包括main函数，但这不是必需的。
The example class in this article also includes the main function, but that is not a requirement.
这一重要区别意味着，关于哪个工人做哪项工作的决定不是必需的。
This important distinction means that decisions about which worker does what work are not required.
对大多数人而言，这些程序都不是必需的，但却无法卸载。
For the most part, these are app you don't need, but you can't remove them.
不过，这是一个可选值，当实际在日程表上显示事件时这不是必需的。
However, this is an optional value and is not required for actually displaying the event on a calendar.
在整个代码库中寻找使用这些特性的机会是不错的做法，但这不是必需的。
It is fine to scan your whole code base for opportunities to use these features, but it is not essential.
所创建的元素可被有选择地返回，但这不是必需的，我们选择不包含这些。
The created element could be optionally returned, but it is not necessary and you chose not to include it.
它们都不是必需的，但都会给现有的版本增加一些健壮性和文档。
Neither are required, but both add a bit of robustness and documentation to the existing version.
显示传递给这个脚本的通配符并不是必需的，但是这会让它显示的输出更清晰。
Quoting any wildcards that you pass to this script isn't necessary but helps simplify the output that it displays.
从上述的集合副本中删除不必要的键，是可接受的，但并不是必需的。
It is acceptable, though not required, to remove unwanted keys from copies of the sets above.
然后帮助器方法会检查组件是不是必需的字段，如果是，就输出星号。
The helper method then checks to see if the component is a required field, and if so it outputs an asterisk.
熟悉安全的基本概念(比如私钥和公钥、签名、加密)会有帮助，但不是必需的。
It is helpful (but not necessary) for you to be familiar with basic concepts of security such as private and public keys, signatures, and encryption.
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