Master文档是一系列文档的集合，把这些文档分开是为了防止做成一个又长又大的文档集。

Master documents are collections of files that ease the editing of what would otherwise be long or large documents.

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因为在历史上很长一段时间里，人们都用一根又长又大的羽毛沾着墨水写字，这种“笔”叫做pen。

This is because for most of the history of writing with pen and ink, a pen was manufactured from a long, large feather.

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我花了一个下午的时间在地面上安装了一个又大又重的地面固定装置，用一条非常长、非常重的摩托车链条把它们锁在一起。

I spent a recent afternoon installing a hefty ground anchor, to which my bikes are now attached with a very long, alarmingly heavy, motorbike chain.

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And he said, "Well,"--Tulle is in a, there's a big valley, it's a real long town, and these houses have balconies like this.

他说"那个",蒂勒在,那有个大山谷,镇子很长,房子都又那种阳台

耶鲁公开课 - 1871年后的法国课程节选