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.
An ulcer is a painful sore or hole in the lining of your stomach wall or intestines. Bacteria are germs that cause infections (in-fek-shuns). This germ is often called H. pylori. People who have ulcers caused by H. pylori develop antibodies (an-ti-bah-dees) to these germs. Antibodies are proteins in your blood that find and destroy substances produced by infections. Antibodies to H. pylori can be found with a blood test.