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Slow, fast, medium are the speed settings in those appliances, for example this mixer-grinder.
Why are there 3 settings, why not only fast? Which setting should be used in which case?
This is for mixer.
At the low speed you have stir / mix. At the high speed you have whip.
You would stir eggs to make scrambled eggs. And you would whip cream to make whipped cream.
Required, but never shown