An arbitrary location, well-crafted and easy to wipe.
任意位置，做工精良，易于擦拭。
Extspaces: An extspace is a logical name associated with a arbitrary string that signifies the location of external data.
Extspaces： extspace是与一个字符串相关联的逻辑名称，该字符串表示外部数据的位置。
The particular memory location and data value that must be written are selected by the host's bus manager, it can't just be any an arbitrary value.
特定的内存位置和数据值必须被写入由主机的总线管理器选择，不可能仅仅是一个任意值。
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