fidelity: implies strict and continuing faithfulness to an obligation, trust, or duty: ~ in the performance of one's duties.   （semper fidelis是美国海军陆战队marine corps的座右铭motto，意思是always faithful永远忠诚）


allegiance: suggests an adherence like that of a citizen to his country and implies an unswerving fidelity maintained despite conflicting obligations or claims: a politician who owes ~ to no special interest.


fealty: implies a fidelity acknowledged by the individual and as compelling as a sworn vow: a critic's only ~ is to truth. (compel强迫某"人", compelling强烈难以抗拒的;令人信服的strong, convincing，如a compelling need/desire强烈的需要/欲望; compelling evidence有说服力的证据)


loyalty: implies a personal and emotional faithfulness that is steadfast in the face of any temptation to renounce, desert, or betray: valued the ~ of his friends.


devotion: stresses zeal and service amounting to self-dedication: a painter's ~ to her artistic vision.


piety: stresses fidelity to obligations regarded as natural and fundamental and the observance of duties required by such fidelity: filial ~ demands that I visit my parents.


fidelity忠诚: 指严格持久地忠于职责义务信任，allegiance效忠: 像公民忠于国家一样，在职责利益有冲突时忠诚，fealty宣誓效忠: 指正式承诺效忠，像宣誓一样强，loyalty忠诚: 指面对诱惑时仍然忠诚，不放弃抛弃背叛，devotion投身: 表示真诚热情地投身，piety虔诚虔敬: 表示自然的或基本的忠诚，以及履行责任


记忆方法: 1）首字母fafldp排序成FAD和FLP时尚飞利浦<==忠诚于时尚


         2）忠诚的意思是忠于责任诺言mean faithfulness to something to which one is bound by pledge or duty or by a sense of what is right or appropriate.