When an engine is ignited, it produces thrust and boosts the rocket into the sky. After the propellant is used up, delay is activated, producing tracking smoke and allowing the rocket a brief coast.
infirmary (plural infirmaries) 1  A place where sick or injured people are cared for, especially a small hospital; sickhouse. 2  A clinic or dispensary within another institution.
A urinary tract infection (UTI) is an infection in the urinary tract. The urinary tract includes the kidneys, the bladder and the urethra. The kidneys are 2 bean-shaped organs that lie against the spine in the lower back. As blood flows through the kidneys, waste is removed and stored in the bladder as urine.