extrinsic: applies to what is distinctly outside the thing in question or is not contained in or derived from its essential nature: sentimental attachment that is ~ to the house's market value.      （如a complex interplay of extrinsic and intrinsic factors内外因素复杂的相互影响，如reasons extrinsic to the music itself音乐本身以外的原因，如nowadays there are fewer extrinsic pressures to get married现在来自外部的结婚压力少了）


extraneous: applies to what is on or comes from the outside and may OR may not be capable of becoming an essential part: ~ arguments that obscure the real issue.      如one is obliged to wade through many pages of extraneous material每个人都得苦读很多页无关的资料，如extraneous events in a story故事里与正题无关的情


foreign: applies to what is so different as to be rejected or repelled or, if admitted, to be incapable of becoming identified or assimilated by the thing in question: inflammation resulting from a ~ body in the eye.   repel排斥to drive or force away； reject拒绝to refuse abruptly          如crime and brutality are foreign to our nature and our country犯罪和暴行与我们的本性和国家相背，如cruelty is foreign to her她生性不残忍，如foreign body/substance异物


alien: is stronger than foreign in suggesting such strangeness as leads to opposition, repugnance, or incompatibility: a practice that is totally ~ to our democratic principles.        如alien taboo外来禁忌，如an alien culture异族文化，alien beings from outer space外星人。和foeign比，alien有明显的贬义  


extrinsic外在: 指明显外在，本质不同，extraneous外在: 也指外在，但语气变弱，可能转变为内在（essential本质根本内在），foreign外国异物的: 十分不同，导致排斥拒绝，无法同化吸收，alien异族异物外星的: 语气更强，导致抵制厌恶不容


记忆方法: 1）首字母EEFA想成A FEE一项收费<==外在

         2）外在的意思是在某物以外mean external to a thing, its essential nature, or its original character.