It is often an indispensable tool in my line of work.

E-mail, which has long been an indispensable tool in business, is beginning to influence more romantic relationships as well.

Blitzmail quickly became an indispensable tool even among those who had never heard of e-mail.

Once children start to think with words, language becomes an indispensable "tool of the mind."

Computers are considered an indispensable tool in the graphic design industry.

This function U is an indispensable tool used in the analysis of many physical systems.

Regional developments and a sound social policy are indispensable tools in this.

We are therefore in our public purpose an indispensable tool to an enriched European future.

At this moment, they are indispensable tools to overcome the crisis on the markets.

The wireless Web has quickly become an indispensable tool in both my business and personal life.