You can also commonly find a number of optional functions in a particular implementation of an ESB pattern.

您通常还可能在 ESB 模式的特定实现中发现一些可选功能。

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Some functions contain optional input parameters, which you can add or remove as needed.

一些函数包含可选的输入参数，可以根据需要添加或删除它们。

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This routing mechanism supports (among other things) optional and mandatory parameters, default values, nested routes, and callback functions.

这个路由机制支持可选和必选参数、默认值、嵌套路由以及回调函数。

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Simply connect the camera to an HDTV with an optional HDMI cable and use your HDTV's remote to control playback functions and navigate the camera's menus from the comfort of your couch.

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