Agriculture was essential to Savannah's economy during its first two centuries.

This information is essential for governmental situation awareness during a major disaster.

Monitoring water quality and growth characteristics are essential to survival during this phase.

It is essential for their success both during practice and while competing.

It is essential during this time to keep the area watered.

The route can be difficult in the winter months and snow chains are essential during this time.

While most retired workers work only part time, they have become essential to the seasonal tourist industry, especially during a period of low unemployment.

'In fact, this could well become essential during the 1990s,' he said.

Your continued support will also be essential during the implementation of the initiative.

Yet it is unquestionably essential to cover the stars, especially during cold and flu season.