?幸而

... bad (或 ill) fortune 坏运气 by good fortune 幸而 come into a fortune 继承一大笔钱 ...

?由于幸运

... best fortune 富贵花开艳阳红 bonne fortune 幸运 by good fortune 幸好, 由于幸运 ...

?幸好

... error by good faith 善意过失 by good fortune 幸好 by good luck 侥幸地 ...