位置:首页 > 英语听力 > 慢速和常速英语听力下载|Special English > 慢速英语|慢速英语听力下载
慢速英语:Drug Helps Teeth Repair Themselves
日期:2017-04-03
Words in This Story

dentist – n. a person whose job is to care for people's teeth

dental – adj. of or relating to teeth or to the work dentists do

dentine – n. a calcareous material similar to but harder and denser than bone that composes the principal mass of a tooth

cavity – n. an area of decay in a tooth

porcelain – n. a hard, white substance that is very delicate and that is made by baking clay

sponge – n. a piece of light natural or artificial material that becomes soft when it is wet, is able to take in and hold liquid, and is used for washing or cleaning

stimulate – v. to make (something) more active

dose – n. the amount of a medicine, drug, or vitamin that is taken at one time


 2/4   首页 上一页 1 2 3 4 下一页 尾页