Вэб толь бичиг

Do you know this?
opal
a translucent mineral consisting of hydrated silica of variable color, some varieties are used as gemstones
differentiate
evolve so as to lead to a new species or develop in a way most suited to the environment
tenonitis
inflammation of a tendon
ring containment
a strategy of defense in cases of bioterrorism, vaccination only of people exposed and others who are in contact with them
betise
a stupid mistake

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