VOA慢速英语:Young Programmer’s App Helps War Veteran Father Sleep Better

convoy – n. a group of vehicles or ships that are traveling together usually for protection

commander – n. a person who is in charge of a group of people

panic – n. a state or feeling of extreme fear that makes someone unable to act or think normally

Post Traumatic Stress Disorder (PTSD) - n. a mental condition that can affect a person who has had a very shocking or difficult experience (such as fighting in a war) and that is usually characterized by depression or anxiety

phase – n. a short period of time during which a person behaves in a particular way or likes a particular thing

veteran – n. someone who fought in a war as a soldier, sailor, etc.

vibrate – v. to move back and forth or from side to side with very short, quick movements

nightmare – n. a dream that frightens a sleeping person : a very bad dream