When inactive, the gates will lay flat on the seafloor; when water levels rise, they will be pumped full of air and rise above the surface to block sea water.
平时，闸门平铺在水底；在海水上涨时，闸门被注满空气，浮到水面阻隔海水。
FIG. 4 illustrates an embodiment of operations performed by the key manager 24 in response to processing (at block 120) an expiration policy 36 defined for the inactive key repository 28.
图4示出响应于处理(在块120)为非活动密钥储存库28定义的到期策略36，密钥管理器24执行的操作的实施例。
FIG. 4 illustrates an embodiment of operations performed by the key manager 24 in response to processing (at block 120) an expiration policy 36 defined for the inactive key repository 28.
图4示出响应于处理(在块120)为非活动密钥储存库28定义的到期策略36，密钥管理器24执行的操作的实施例。
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