some are optional 常用的命令标志符如下 ; 令标记符如下
some optional
一些可选的
以上为机器翻译结果，长、整句建议使用 人工翻译 。
We omitted some optional fields for simplicity.
为了简单起见，我们省略了一些可选域。
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Some optional items that I found useful are as follows.
一些可选项目，我发现有用的内容如下。
Some optional subelements, including a set of elements each mapped to a locale.
一些可选的子元素，包括一组元素，这组元素中的每个元素都映射到一个位置。
Charge some optional admission, like we charge for museums, and use the proceeds to pay off claimants to the orphaned works.
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Indeed, even some optional areas where you go solely for the loot will mean an extra encounter or three with monsters.
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The Odyssey also has some new optional safety equipment, including forward collision and lane departure warning systems.
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