在Web服务交互涉及到有状态资源(如购物车、打印机、打印作业等等)的情况下，WS -ResourceFramework是必需的。
WS-Resource Framework is essential where the stateful resources involved in the Web services interaction such as shopping cart, printer, print job, and so on.
TTU是引擎层上所必需的，并且如果在ETL作业中使用了Teradta早期工作台，那么还必须安装在客户机层上。
TTU is required on the engine tier and must also be installed on the client tier if the Teradata legacy stages are used in ETL jobs. TTU depends on the following packages.
家庭作业被继续分配下去——以未曾有过的更多数量——尽管在大多数案例中缺乏这样做是否必需或而有帮助的证据。
Homework continues to be assigned - in ever greater quantities - despite the absence of evidence that it's necessary or even helpful in most cases.
当一名用户从个性化编写服务器上开始发布作业时，程序将提供一个具有完成该作业所必需的信息的本地servlet。
When a user begins a publishing job from the personalization authoring environment, the local servlet is provided with the set of information necessary to complete the job.
在作业设施和宿舍范围内须有急救必需品以合理的方式提供。
First aid supplies should be reasonably available at the facility and dormitory.
使用动力工具时，除了现场作业所必需的标准PPE，可能还需要其他PPE。
The use of power tools may require additional PPE to the standard PPE mandatory on site.
你们的家庭作业必需及时完成。
你们的家庭作业必需及时完成。
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