Using external energy is fundamental to being a human.

Achieving higher pressures necessitates greater use of external energy to power the compression.

"To see - receive sensory awareness of external energy," the Caleban said.

You may have solved them both by chance at the same time, but at some cost in external energy.

Some systems are passive, others are active (requiring other external energy to function).

This approach is cheap, reliable and passive (requires no external energy).

No external energy is used and the reactions are carried out with a small amount of O.

This term is sometimes called the external energy.

"And it's the addition of external energy that will destroy the Bajoran wormhole?"

Anyhow, he did escape by energy, external or internal.