这个窗口很小（最多几秒钟），要遇到这个窗口，冲突的预订请求需要在该窗口中被创建并交付到 R&R 数据库。
This window was tiny (a few seconds at most), and for it to be encountered, conflicting reservation requests needed to be created or delivered to the R&R database within that window.
当变更请求到来时，要对变更进行考察，看其是否与现有的需求有潜在的冲突。
When change requests come in, they need to be scrutinized for potential conflicts with existing requirements.
此限制与接收冲突限制不同，因为请求-响应操作在对应的应答活动执行完成之前都处于活动状态。
This restriction is different from the conflicting receive restriction, since a request-response operation is said to be active until the corresponding reply activity has been executed.
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