A context item is an immutable object and contains state.

上下文项是不可变的对象，并包含状态。

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If the context item is undefined, you have no way to select nodes from the document.

如果上下文item未定义，您就无法从文档中选择节点。

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The second argument to subsequence is the starting position; the dot represents the context item.

subsequence的第二个参数是开始位置，点号表示上下文项。

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The context is how you are interacting on the item itself.

FORBES: Modeling Enterprise Social Business Processes

Descriptions of each item and videos, with expert curators speaking about selected items, provide context for users, and are intended to spark curiosity and encourage both students and the general public to learn more about the cultural heritage of all countries.

UNESCO: Communication and Information