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。

youdao

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。

youdao

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

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

youdao

Begin the following day with a big bang for an optional but additional fee by touring the lively market at Otavalo, chock full of traditional Andean wares, exotic snacks and impromptu pipe performances.

BBC: Daily deal: Ecuador and the Galapagos

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