artificial: is applicable to anything that is not the reult of natural processes or conditions: the state is an ~ society; but especially to something that has a counterpart in nature or imitates something natural: ~ teeth. （来自两个词根ART表示skill技术，和词根FIC表示feign假装，如artificial satellite/intelligence/island人造卫星/人工智能/人造岛屿） process过程 condition状态 imitate模仿 counterpart相对应的人或物
factitious: applies chiefly to emotions or states of mind not naturally caused or spontaneously aroused but artfully produced to serve some end: created a ~ demand for the product. 如factitious enthusiasm假装的热情，本例伪造的需求 spontaneous自发的=natural (词根FAC表示to make, do制作，如fact事实原表示something done做的事factory工厂factotum勤杂工factor因素facile简单(做起来容易)facilitate协助benefactor赞助人manufacture制造）
synthetic: applies especially to a manufactured substance or to a natural substance so treated that it acquires the appearance or qualities of another and may substitute for it: ~ furs. 皮毛 manufacture制造，多指使用机器的大规模工业制造，如manufacturing制造业
ersatz: often implies the use of an inferior substitute for a natural product: served ~ cream with the coffee. ersatz coffee咖啡替代品
artificial人造: 泛指不是自然的产物，而是仿制品替代物，factitious虚情假意: 用于情绪和思想状态，synthetic合成: 指工业制造的物质，ersatz代用替代: 常指劣质替代物，替代天然
记忆方法: 1）首字母AFSE是FALSE虚假少了L<==L由人造
2）人造的意思是人工制造非天然mean brought into being not by nature but by human art or effort.
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