as merry as the day is long

例句：

1. 1.They spent the entire day enjoying themselves, as merry as the day is long.
   他们整天都很开心，就像一天那么长。
2. 2.The children were so merry that they forgot to eat dinner.
   孩子们太开心了，以至于忘了吃晚饭。
3. 3.After a week of hard work, she felt as merry as the day is long.
   经过一周的努力工作后，她感到非常高兴，就像一天那么长。