transient: applies to what is actually short in duration or stay: a hotel catering primarily to ~ guests.


transitory: applies to what is by its nature or essense bound to change, pass, or come to an end: fame in the movies is ~.   请注意，transient和transitory重音都在第一个音节


ephemeral: implies brevity of life or duration: much slang is ~.


momentary: suggests coming and going quickly, often merely as a brief interruption of a more enduring state or course: my feelings of guilt were only ~.   如President Trump met Yang Jiechi momentarily(表示特朗普过来见了杨洁篪一面，很快就中途离开).


fugitive: implies passing so quickly as to make apprehending difficult: in winter the days are short and sunshine is ~.


fleeting: is close to fugitive but stresses the difficulty or impossibility of holding back from flight: a life with only ~ moments of joy.


evanescent: suggests momentary existence, a quick vanishing, and an airy or fragile quality: the story has an ~ touch of whimsy that is lost on stage.


short-lived: implies extreme brievity of life or existence, often of what might be expected to last or live longer: ~ satisfaction.


transient短暂: 事实上或者叫实际上短暂，transitory短暂: 本质上注定改变度过结束，ephemeral: 生命或持续期短暂，momentary: 来去很快，停留很短，常只是对其他活动的一次打断，fugitive短暂稍纵即逝: 快速经过难以抓住，fleeting同上: 意思类似，强调难以停止挽留，evanescent短暂: 形容短暂存在、转瞬消失、飘渺脆弱，short-lived短暂: 本希望更长久一些，通常用于美好的事物


记忆方法: 1) 首字母TTEMFFES调整顺序为TM FEET FS时间的脚步飞逝<==人生短暂
       
         2) 短暂的意思是持续或停留时间短mean lasting or staying only a short time.首字母TTEMFFES调整顺序为TM FEET FS时间的脚步飞逝<==人生短暂