A two - (or more) cell strategy provides the capability to divert traffic to an alternate cell (cell b) while maintenance is being applied to a primary cell (cell a).
在您对主要单元(单元a)进行维护时，一个两单元(或者多单元)策略可以使流量转移到一个可替换的单元(单元b)。
An aircraft has nosed over on the paved runway, airport closed. Please divert to your alternate.
一架飞机在跑道面拿大顶，机场关闭，请改航到你的备降机场。
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