Here is a look at three cars introduced over the years.

You should introduce fish a few at a time, over a period of several weeks.

They all seem healthy, and were introduced over 4 months.

Other minor changes were introduced over the course of the year.

The T2b was introduced by way of gradual change over three years.

Several machines, which cost $4,000 to $7,000, have been introduced over the last two years.

Even more after several design updates have been introduced over the years.

Many alternatives to the traditional seat stay design have been introduced over the years.

This service was also very successful and new ships were introduced over the next few years.

New York plans to introduce competition gradually over the next five years.