injure: implies the inflicting of anything detrimental to one's looks, comfort, health, or success: an accident that ~d him physically and emotionally.     （detrimental有害implies something obviously, but not necessarily extremely, harmful to the thing it affects指某物明显有害，但不一定十分严重，如the detrimental effects of prolonged fasting长期禁食的明显害处）


harm: often stresses the inflicting of pain, suffering, or loss: be careful not to ~ the animals.      suffer受苦受难受折磨


hurt: implies the inflicting of a wound to the body or to the feelings: ~ by her callous remarks.


damage: suggests the inflicting of an injury that lowers value or impairs usefulness: a table that was ~d in shipping.       damage用injury和impair解释，表示导致价值或作用降低，可见injure和impair是更基础的词


impair: suggests a making less complete or efficient by deterioration or dimimution: years of somking had ~ed his health.     deteriorate和impair互相解释，都表示逐渐损害    diminution减少降低缩小=reduction


mar: applies to disfiguration or maiming that spoils perfection or well-being: the text is ~red by numerous typos.      如a number of problems marred the smooth running of this event许多问题影响了这件事的顺利进行


injure伤害: 泛指任何损害，harm伤害: 常指苦痛损失，hurt伤害: 指造成身心创伤，damage损坏: 表示降低价值作用，impair损害: 表示逐渐损害，使不再完善有效，mar破坏损毁: 指损坏肢体外观，最严重


记忆方法: 1) 首字母IHHDIM重组成HI Da HI Ma嗨打嗨骂<==伤害      严重程度mar>harm>hurt>damage>injure>impair

                2) 伤害的意思是使不再完好健全mean to affect someone or something so as to rob it of soundness or strength or to reduce its value, usefulness, or effectiveness.首字母IHHDIM重组成HI Da HI Ma嗨打嗨骂<==伤害