比起简单地删除旧文件，根据环境复杂度进行删除可能更加困难。
As compared to simply removing old files, this can be a more difficult undertaking depending on the environment complexity.
符合技能挑战——提供可适应/可调整的界面，环境复杂度对用户技术等级的要求控制在用户能力范围内。
Match challenges to skills—Offer an adaptable/adjustable interface that givesusers control over their environment’s complexity that is appropriate to their skilllevel.
在此基础上，通过将用频网络转化成有向图，提出了基于有向图的电磁环境复杂度度量算法，并以此算法为基础定义了战场电磁环境复杂度。
A four-degree electromagnetic environment complexity metrics algorithm of radio-used network is defined based on the SNR parameters of radio receiver and availability of the network.
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