介绍:
A mayfly only lives for about a day. It unfolds its wings for the first time in the morning, and folds them for the last time at night. That’s just long enough for mayflies to mate and lay their eggs before they die.
1.mayfly：蜉蝣
2.unfold：展开，打开
3.mate：交配；使交配
4.lay：产卵
大家还在听
