It's the list of field names, types, and optional additional information (like the size, nullable, etc.) that adds some complexity.

它是字段名称、类型和可选附加信息(如大小、nullable)的列表，这些可选附加信息会使名称变得比较复杂。

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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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User's distinguish name (additional information, optional, default: blank).

User ' s distinguish name(附加信息，可选，缺省：空白)。

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The optional Tether Kit offers additional flexibility to users who do not want to permamently attach the laptop locking station to a desktop surface.

ENGADGET: Kensington's Laptop Locking Station is a thief's worst nightmare... maybe

Mustang will be the first vehicle that will offer AppLink with the standard SYNC interface, as well as be integrated into the optional Voice-Activated Navigation System, providing the additional convenience of an 8-inch touch screen for control.

ENGADGET: Ford SYNC AppLink hands-on in a little green Fiesta