long-day的用法和样例：
词汇搭配
- long day breeder 长日照发情家畜...
- all day long 全天
- happy as the day is long 非常快乐
- as merry as the day is long 非常快乐
- many a long day 好久
- merry as the day is long 非常快乐
- as the day is long 终日,一贯地...
- Never is a long day 不要轻易讲'决不'...
- as happy as the day is long 非常快乐
