取得第一个区域与第二个区域组合时的互补。

Gets the complement of that first region when combined with the second region.

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一到加尔各答，他们就睡在大街上或是人力车里，或在由一个叫萨达尔的人管理的车库、修理店和宿舍的组合区域 dera 里。

Once in Kolkata, they sleep on the street or in their rickshaws or in a dera—a combination of garage and repair shop and dormitory managed by someone called a sardar.

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例如，bolt 是一种部件类型，可以将它与 CarriageBolt 等区域名称串联起来，创建部件名称/类型组合（例如 CarriageBolt）。

For example, bolt is a part type and is concatenated with area names like CarriageBolt to create part name/type combinations (e.g., CarriageBolt).

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