Demos are an optional way to see the same steps described in the article.

演示是展示本文所描述步骤的可选方式。

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Demos are an optional way to see the same steps described in the tutorial.

演示是查看教程中介绍的同样步骤的可选方式。

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The technical attributes view in WBM, as shown in Figure 5, provides an optional way to specify technical details that are used to implement a process, global task, or service on WPS.

WBM 中的技术属性视图（如 图 5 中所示）提供了一种可选的方式，用以指定用于在 WPS 上实现流程、全局任务或服务的技术细节。

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Unlike some other on-line retailers who seem to think the card is optional, Amazon has never left me hanging in this way.

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If our elected officials truly want to modify a system in a creative way, why not at least allow small pilot projects for purely optional premium support programs for seniors who want to find cheaper insurance more tailored to their own needs?

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Turbocharging is also making its way into larger vehicles, like the 2012 Ford Explorer, which gets an optional turbo engine.

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