该配置在内部被表示为一个散集列表(scatter - gather)，列表中的每个条目表示一个地址和一个长度。
Internally, this configuration is represented as a scatter-gather list (with each entry in the list representing an address and a length).
如果一个交互式计算机屏幕要在实用性上与白板相匹配，它必须在手臂长度范围和横跨房间范围内是可视的。
If an interactive computer screen is to match a whiteboard in usefulness, it must be viewable from arm's length as well as from across a room.
在创建队列时，用户必须指定队列的最大长度和一个消息的最大大小。
During queue creation, the user must specify the maximum length of the queue and the maximum size of an individual message.
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