Comment on “Make Players Happy”

I'm confused about what this part of the Dispel Magic text means.

"Enchanted items, such as scrolls, potions, rings, wands, staffs, rods, armor, weapons and so on are not affected by the spell. However, dispel magic will dispel the lasting effects caused by those items."

So the items themselves won't get broken or anything, OK. But what are the "lasting effects" here? It makes sense to me for, say, a potion - you drink the potion, you get an effect, but then somebody casts Dispel on you and the effect gets canceled.

However I don't understand what it would mean to have "lasting effects" if the item is, say, a magic sword or rod. If it lets you cast some spell or whatever, then yeah, same as the potion example above - that particular casting's effects get shut off. But what if it's just a +1 sword? Or some other "static" bonus?

Could you give some examples?