寄存处：用来暂时存放帽子、大衣、行李或其它物件的地方。
Checkroom: a place where hats, coats, packages, or other items can be stored temporarily.
并同时包含由内容项目构成的暂时性状态，包括一组目前选取的物件，以及要用在设计介面上处理物件的编辑工具。
It also includes transient state consisting of context items including the set of currently selected objects as well as the editing tool being used to manipulate objects on the design surface.
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