Hot water near the surface of Earth can be used directly for heat.

The songs are also used directly in some reading programs.

Even when you're not directly using that idea, it's there in the background.

So the energy is used directly by the life form?

Sell everything that cannot be used directly in your survival effort.

Only an insignificant part was used directly as food for man.

The seeds are sometimes used to season food directly in France.

This negative can be used directly in the printing process.

What if they should be used directly against each other in battle?

Participants are allowed to take such contacts directly using any available means of communication.