Planets of the solar system in comparison with the sunPlanets of the solar system in comparison with the sun
Anti-tank system - self-propelled anti-aircraft missile systemAnti-tank system - self-propelled anti-aircraft missile system
The operating system is distinguished by its complexityThe operating system is distinguished by its complexity
Windows 7 is a custom operating system of the windows nt familyWindows 7 is a custom operating system of the Windows NT family