what does it mean "great deal" here?
Living Longer With…Wine?
While it’s true that we’ve made huge jumps in medicine that has done a great deal on keeping us healthy and living longer, but that’s not the only thing keeping us going.
a great deal = a lot, a large amount There are several errors in that sentence. "has" should be "have". "on" is not the correct preposition.
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a great deal = a lot, a large amount
There are several errors in that sentence. "has" should be "have". "on" is not the correct preposition. "While ... but ..." is not correct: one or the other should be used, but not both together.