他邊走邊用口哨吹著快樂的曲子。
He whistled a happy tune as he walked along.
沒能上大學焉知非福，我想你在大學里是不會覺得快樂的。
Not getting into university may be a blessing in disguise; I don't think you'd have been happy there.
斜線號一種斜線符號，尤用於對選擇加以區分，如和／或者，表示每 ... 這一詞，如英里／小時，和在詩尾表示連續列印行，如老國王考勒／是一個快樂的老人
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.
我可以向你保證，你兒子在這裡會很快樂的。
I can assure you that your son will be happy here.
