他边走边用口哨吹著快乐的曲子。
He whistled a happy tune as he walked along.
没能上大学焉知非福，我想你在大学里是不会觉得快乐的。
Not getting into university may be a blessing in disguise; I don't think you'd have been happy there.
斜线号一种斜线符号，尤用于对选择加以区分，如和／或者，表示每 ... 这一词，如英里／小时，和在诗尾表示连续打印行，如老国王考勒／是一个快乐的老人
A diagonal mark(/) used especially to separate alternatives, as in and/or, to represent the word per, as in miles/hour, and to indicate the ends of verse lines printed continuously, as in Old King Cole/Was a merry old soul.
我可以向你保证，你儿子在这里会很快乐的。
I can assure you that your son will be happy here.
