complex: suggests the unavoidable result of bringing together various parts, notions, or details and does not imply a fault or failure: a ~ problem that calls for a ~ solution.
complicated: applies to what offers difficulty in understanding, solving, or dealing with: baffled by the ~ budgetary procedures.
intricate: suggests difficulty of understanding or appreciating quickly because of perplexing interweaving or interacting of parts: the ~ balance of power among nations. （perplex困惑adds to puzzle a suggestion of worry and uncertainly, especially about making a necessary decision，如an odd change of personality that perplexed her friends她奇怪的性格改变令朋友感到困惑）
involved: implies extreme complication and often disorder: an ~ explanation that clarifies nothing.
knotty: suggests complication and entanglement that make solution or understanding impossible: ~ questions concerning freedom of press and censorship. entangle缠绕卷住陷入
complex复杂: 表示不可避免的结果，因为部分概念细节多，而非过失过错，complicated复杂: 指难以理解解决处理，intricate复杂: 表示各部分交互交织使人困惑，involved复杂: 指极端复杂，常表示混乱，knotty复杂多结节: 到了无法理解解决的程度
记忆方法: 1）首字母CCIIK一次一次看,反复看<==复杂 复的本义是"返回,回来"，会意字从从日从夊。""意为"朝一个方向延展"，日指太阳，夊是"止"的变体，表示和脚或行走有关。日夊联合起来表示"太阳回到东方起点上"，即本义是太阳返回，即日复一日。太阳返回不是一次性的，因此引申为表示"不是单一的或一次性的"。本义引申义较难区分也不必区分，如往复回复恢复答复复习复杂复方山重水复 "杂"表示"由多个种类构成"，本义指"以各种彩色搭配制作衣服"，引申指"参和混合"，又引申为"不纯的"。最早杂字由"衣"和"集"构成，经过不断简化，从字形上已经看不出来了。<说文解字>对杂的解释:"五彩相会，从衣集声"
2）复杂的意思是交织难辨mean having confusingly interrelated parts. 之前参加一次考试，抽到的作文题目是"复杂度complexity"，引用过这段话:"Fools ignore complexity. Pragmatists suffer it. Some can avoid it. Geniuses remove it天才消灭复杂度"，软件工程software engineering的"中心任务"是"控制复杂度complexity control"，"控制复杂度只有一种方法：divide and conquer分而治之"，"分析analyze"是指把复杂的事物分隔成组成部分或元素analyze means to divide a complex whole into its parts or elements，有一种观点: "如果你能把一个大问题分隔成几个小问题，问题就已经解决了一大半"，可见分析是关键。
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