Significats de internal fuel en anglès

Maybe theirs don't look like ours, or are hidden, but I'm guessing they work with internal fuel only.

There's no internal fuel tanks.

The astronauts aboard the orbiter would continue to fly it into space using internal fuel for the final acceleration to orbit velocity.

They'd dropped them over Randolph, New York, three hundred and twenty miles from takeoff, which gave them roughly another thousand miles on internal fuel.