treat sb to sth意思是招待某人吃什么东西。
It is a great treat for sb to do sth
做某事是难得的乐事
It is a great treat for sb to do sth 做某事是难得的乐事
He treated his friends in his country cottage.
他在他的乡间别墅款待了他的朋友们。
Frank treated us to dinner.
弗兰克请我们吃饭。
treat sb with sth意思是以……方式对待某人。
例句：The crowd were treated to a superb display of tennis.
观众看了一场非常精彩的网球赛，大饱眼福。
He treated his subordinates with respect.
他对部下以礼相待。
He was coolly treated by the boss.
他受到老板的冷遇。
He treated his horses well.
他待他的马很好。