Pressure and speed can be adjusted freely by optional requirement of the work pieces.

压力及速度均可依所需工件自由调整。

youdao

To realize this requirement composite applications implementations need the ability to disable optional activities in a business process.

为了实现此要求，组合应用程序实现需要能够禁用业务流程中的可选活动。

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You can specify an optional dependency requirement that can be satisfied by a J2EE datasource capability using a dependency relationship link, as shown in Listing 18.

您还可以确定一个可选择性的从属需求，这个需求可以由一个J2EE数据源性能通过使用一个从属关系连接来实现，如清单18所示。

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The American Medical Association and other medical societies recommended that the portal requirement and other patient-driven measures be optional.

FORBES: Is there a business case for engaging patients?