relevant: implies a traceable, significant, logical connection: use any ~ evidence to support your argument.   (trace踪迹痕迹，泛指任何留下的轨迹标志影响等may suggest any line, mark, or discernible effect left behind，如an animal species believed to have vanished without trace相信这种动物已经消失得无影无踪了。这里traceable表示可以追踪追溯）
connection表示联系，是关系的基础词


germane: may additionally imply a fitness for or appropriateness to the situation or occasion: a topic not ~ to our discussion.  appropriate和fit都表示合适适用readiness to use，意思没有区别, fit更口语化，appropriate更正式语气更强，在2017-12-12 合适fit-felicitous中，felicity表示行为得体适宜或语言贴切


material: implies so close a relationship that it cannot be altered without obvious deleterious effect: the scene is ~ to the rest of the play.    deleterious有害的，强调是意想不到的


pertinent: stresses a clear and decisive relevance: a ~ observation that cut to the heart of the problem.


apposite: suggests a marked and felicitous relevance: the anecdotes in his sermons are always ~. mark标记,使人能注意,marked明显的，不需要强调


applicable: applies to something such as a general rule or principle that may be brought to bear upon or used fittingly in reference to a particular case, instance, or problem: a precedent that is not ~ in this case.  （in reference to=with reference to意思是关于about，如I am writing in reference to your ad我正在写关于你广告的材料，如解释中be used in reference to a case使用关于某个案例，即用于某个案例）  （to bring to bear upon something表示去处理应对某事to deal with something,如British scientists have brought computer science to bear on this problem英国科学家们已经应用计算机科学来处理这个问题，bear upon还表示有关系涉及，见末尾注释）


apropos: suggests what is both relevant and opportune: for your term paper use only ~ quotations.   （opportune适时的implies what happens at the best possible moment，如an idea that arose from an opportune remark一句正是时候的话催生了那个想法）


relevant(直接)相关: 表示具有重要的逻辑的可追溯的联系，强调直接相关，germane适合恰当: 增加了适合的意思，material实质性: 表示密切相关，不可缺少，否则会有损害，pertinent密切: 强调清晰决断的相关性，apposite得体适宜贴切: 表示行为言语得体适宜贴切，applicable适用: 表示通用规则原则可以处理或用于某一实例案例问题，apropos合时宜: 表示正是时候


记忆方法: 1）首字母RGMPAAA排序成MAGA RAP，其中RAP是说唱歌曲，MAGA是川普竞选口号<==相关         MAGA: Make America Great Again使美国再次伟大是川普的竞选口号，但不是川普最先提出来的，之前里根用过              

         2）相关的意思是有关系mean relating to or bearing upon the matter at hand.    （to bear upon something有关涉及to relate to something , 如these are matters that bear on the welfare of the community这些事情关系到社群的福祉）