These differences in life expectancy increased between the 1970s and 1990s.

Once the twins left the room, the differences between them would increase.

Thus the difference in the two valleys depth increases over time.

These differences made operating the guns safer and increased the rate of fire.

There is evidence, however, to show that these differences in school attainment at age 7 do not decrease, but rather increase as children get older.

Such a difference could increase the possibility of greater inequality within America.

"Then the difference between any person's two ages here will increase less than we had thought."

Today, he said, that difference has increased to 19 times as much.

The difference in speed is called slip and increases with load.

I must point out that economic differences have also increased over the years.