lucky: stresses the agency of chance in bringing out a favorable result: the ~ day I met my future wife.   （chance偶然，泛指由无法理解控制的力量所决定的is the most general term and may imply determination by irrational, uncontrollable forces，如a chance meeting/encounter邂逅，如they chanced to be staying at the same hotel他们碰巧住在同一家旅馆，如left things to chance听天由命）  (to bring about产生导致带来，如interest-rate cuts have failed to bring about economic recovery利率下调没有带来经济复苏，如本例带来有利结果）


fortunate: suggests being rewarded beyond one's deserts or expectations: have been ~ in my business investments.   deserve应得的，可贬可褒，如I don't deserve you我配不上你，大多数时候是反讽，如you deserve your success你的成功名至实归，是褒义


happy: combines the implications of lucky and fortunate, with its more common meaning of being blessed: a life that has been a series of ~ accidents.


providential: more definitely implies the help or intervention of a higher power in the coming of good or the averting of evil fortune: it was ~ that the rescuers arrived in the nick of time.  最后时刻关键时刻at the last possible moment，如we just got out in the nick of time我们在千钧一发之际逃了出来


lucky幸运: 表示偶然的好结果，fortunate幸运: 表示回报超过应得或预期，happy幸福幸运: 兼具两词含义，但更多表示被祝福的，providential幸运天赐天助:  指上天的帮助干预，带来好运避免厄运


记忆方法: 1）首字母LFHP福乐平和<==幸运

         2）幸运的意思是意外的成功mean meeting with or producing unforeseen success.