lay an egg

例句：

1. 1.She laid an egg this morning.
   她今天早上下了一蛋。
2. 2. The chicken laid an egg in the nest.
   这只鸡在窝里下了一蛋。
3. 3. The farmer laid eggs from his chickens every day.
   这位农民每天从他的鸡下蛋。