If three or more optional arguments are supplied, the third option is assigned to the width variable.

如果提供了三个或多个可选参数，那么第三个选项被分配给width变量。

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If you decide later to add more optional parts, download the additional optional parts and rerun the extraction tool prior to attempting the installation.

如果您决定过后再添加更多的可选部分，那么下载附加可选部分，并在试图安装之前重新运行提取工具。

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If you choose one or more optional IBM value-add software packages, a screen with a licensing summary of all selected packages appears, as shown in Figure 13.

如果选择了一个或多个可选的IBM增值软件包，此时将显示包含所有选定包的许可协议汇总的屏幕，如图13所示。

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While cruises are more optional than planes and vehicle when travelling, the odds of dying are nearly as slim as flying.

BBC: What is the safest mode of travel?

That encourages customers to spend more on optional equipment.

ECONOMIST: The global car industry

This truly portable library can carry up to 1000 titles - and now even 8000 titles more with an optional microSD card.

ENGADGET: Bookeen's upgraded, colorful Cybook Opus to debut on May 7