"Esters" Natural Recordings by Native Speakers
Esters are a class of compounds that are formed by the reaction of an acid with an alcohol. They have a general formula of RCOOR', where R' is an alcohol and RCOO is the acid. Esters are commonly found in nature and are also used in the production of fragrances, food and beverages, and pharmaceuticals. Examples of esters include ethyl acetate,叔butyl acetate, andIsoamyl acetate. Esters have a characteristic sweet and fruity smell, and are often used as flavorings and fragrances in food, cosmetics and perfumes. Esters can also be used as plasticizers, coatings, and cleaning products.