VOA慢速英语:New Rotavirus Vaccine Could Save Thousands of Children

diarrheal – adj. related to an illness that causes you to pass waste from your body very frequently and in liquid rather than solid form

infection – n. the act or process of infecting someone or something : the state of being infected

gastro-intestinal tract – n. an organ system in humans and animals that takes in food, digests it and expels the remaining waste

refrigeration – n. the act of keeping something cold to keep it fresh

placebo – n. a pill or substance that is given to a patient like a drug but that has no physical effect on the patient

clinical trial – n. a scientifically controlled study of the safety and effectiveness of a drug or vaccine using consenting humans for subjects

effective – adj. producing a result that is wanted

conduct – v. to plan and do something

efficient – adj. capable of producing desired results without wasting materials, time, or energy

liquid – n. a substance that is able to flow freely

Immunological disorder – n. a disorder or problem with the immune system