The state of idle file descriptors is known since the pollcache service is notified once when it changes.
空闲文件描述符的状态是已知的，因为在状态改变时会通知 poll缓存服务。
The merge executes twice, once when it receives control from the lower start node, and again when it receives control from the join.
merge执行了两次，在接收到来自下面的开始节点的控制时会执行一次，而在接收到来自join的控制时会再次执行。
We will keep in mind your requirement for... and shall contact you once (when) it is available.
我方会留心你方对…要求，一旦有货将立即同你方联系。
We will keep in mind your requirement for... and shall contact you once (when) it is available.
我方会留心你方对…要求，一旦有货将立即同你方联系。
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