beat swords into ploughshares

例句：

1. 1. The old man was beatenswords into ploughshares byhis grandson.
   老人被他的孙子磨成了镰刀。
2. 2. The farmer had to beat swords into ploughshares to makethe land fertile again.
   农民不得不把剑磨成镰刀，使土地重新肥沃。
3. 3. The warriorwas beaten swords into ploughshares by his opponent's blows.
   战士被对手的打击磨成了镰刀。