Your mother's decision is the final word on the matter.这个问题由你妈妈最后拍板决定。

Why do you always have to have the last word? [=to be the last person to speak]为什么总是非得你来最后下结论？

The judge will have the last word [=the final say] on the divorce agreement.法官对离婚协议将有最终决定权。

This is the last word in wireless phones.这是最新款的无绳电话。

The van's design is the last word in safety.这款面包车的设计在安全性能上是最好的。