他训练了几只信鸽用来传递重要的信件。

He trained several ___pigeons to deliver important letters.

公园里的鸽子在喷泉边悠闲地散步。

The ___pigeons are strolling leisurely around the fountain in the park.

那个赌徒把新手玩家当成了容易上当的傻瓜。

The gambler treated the new player as an easy ___pigeon at the poker table.