Any required or optional service data inputs and outputs.

任何被要求或者可选的服务数据输入和输出。

youdao

It is an optional service that can be used to store session state data outside of the Web application memory space.

有一项可选服务可将会话状态数据保存在web应用程序内存之外。

youdao

An example of an optional service is the policy service because not all repositories can (or need to) express their administration policies in a general way.

可选服务以策略服务为例，因为一般来说不是所有的知识库能够(或者需要)展示其管理策略。

youdao

The detachable unit consists of a 3.5-inch LCD which gets its navigation information from an SD card, and if you opt for TomTom's optional service package it'll provide real time traffic info as well.

ENGADGET: Eclipse's AVN 2210p apes TomTom One's portable style

Nominet, the organisation that oversees UK web addresses, has put the brakes on plans to launch an optional new service for sites ending with ".uk".

BBC: Shorter .uk web address idea shelved by Nominet

The app also features an optional upgrade service from Evoz that provides advanced monitoring, cry notifications via text or email, cry history information, and analysis of baby's crying and sleep patterns.

ENGADGET: Belkin WeMo Baby monitor lets you listen to Junior via an internet connection and an iOS device