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
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