VOA慢速英语:Some Volcanic Clays Kill Bacteria

pathogen – n. something such as bacteria or a virus that causes disease

oxidize – v. to change (a compound) by increasing the proportion of the electronegative part or change (an element or ion) from a lower to a higher positive valence; remove one or more electrons from (an atom, ion, or molecule)

antibiotic – n. a drug that is used to kill harmful bacteria and to cure infections

pore – n. a small opening, especially in an animal or plant, on by which matter passes through a membrane