Using directives, which are used for control and action, you can use one template and conditionally render specific references.

使用用于控制和操作的 指令，可以使用一个模板，并且可以有条件地放弃某些引用。

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Using directives, you can conditionally process your makefile, display error messages, include other makefiles, undefine a macro, and turn certain options on or off.

使用指令可以有条件地处理生成文件，显示错误消息，包括其他生成文件，取消定义宏以及打开或关闭某些选项。

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Import Symbol Completion, completes the names of types and extension methods available in the current project; it also automatically adds the appropriate using directives when necessary.

导入符号完成，使在当前项目中完成类型名名称和扩展方法成为可能。它也在需要的时候自动添加适当的using引用。

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Insurer Aetna began using nurse-care managers to help manage both Medicare and commercially insured patients with terminal illness in 2004, using telephone consultations with patients, doctors and families to, among other things, ensure advance directives are in place and complied with.

WSJ: New Efforts to Simplify End-of-Life-Care Wishes