The main variable is what kind of storage tape they use.

The main political variable in the coming weeks, though, appears to be the behavior of the economy.

The main variable is the number of occupants in the apartment.

In the first of these three cases, education formed the main variable.

Teachers said the two main variables affecting the program were time and money.

Believe me, it would take you a week just to rule out impossible combinations of the main variables.

The two main variables in air are the temperature and the humidity since everything else is pretty much the same all over the world.

The processes and people of concern or study are the main variables.

The other main variables are a phone's weight, size and styling.

The main variables are the material to be used and the geometry of the containers.