是幸 meaning in Chinese

(at the end of a request) much obliged

Those who survived the ship wreck of the titanic were certainly lucky
那些经历泰坦尼克号海难仍生还的人无疑是幸运的
I thought the happiness should be happy for ever , then i found that it is good luck to get something the god gave , but it is a worthless fortune you know that what you have and cherish them , that is the happiness ! !
曾经以为幸福就是永远的快乐，后来渐渐明白，原来上天给了你多少，那是幸，而你究竟懂得多少，那是福！