but和duck的读音相同吗

读音相同，都读[ʌ]音。
But his death was so needless.

然而他的死却太没有必要了。

The bike is rusty but usable.

自行车生锈了，但还能骑。

He is firm but not doctrinaire.

他意志坚定但不教条。

It was a tough but clean game.

这是一场打得艰苦但却是规规矩矩的比赛。

Duck is high in protein.

鸭肉的蛋白质含量很高。