For many combustion and plasma systems, detailed mechanisms are not available or require development.

Because the massive mechanism requires frequent lubrication and attention, public access is often restricted.

This mechanism requires the colormap to be composed of three separate tables, one for each primary color.

These six mechanisms for representing colors with pixelvalues all require some additional parameters to work.

The superior planets are much more complex and their mechanisms require significant extra hardware.

The proposed mechanism implies a negative energy density, and thus requires exotic matter.

No particular social mechanism requires it today; nothing insists on it.

The mechanisms are configured up-front and require no further effort on the user's part.

The mechanism for reducing the movement usually requires the movement to be free of backlash.

These mechanisms, collectively known as the school-based option, require agreement between the principal and the union chapter leader.