2. a great deal 大量;很多
eg: As there is _________(大量的)salt water in the world, maybe we can go without fresh water.
a great deal=a good deal相当于adv.或n.
In the late 19th century, Europe changed a great deal.
He ate a great deal for supper yesterday.
He ran a great deal faster than I.
A great deal of money was spent on the project.