Englishfor English speakers
breakthrough
Noun
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A breakthrough is a sudden change, a change from not being able to do something to being able to do something.
After the breakthrough, rubber could be made in a factory and rubber trees were no longer the only source of rubber.
advertising
Noun
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Advertising is the business or study of using newspapers, TV, etc. to sell products or inform people.
Coke has a new advertising campaign for a new drink.
There's too much advertising on radio.