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There are currently 165 COVID-19 vaccines being tested around the world. Testing new vaccines is usually a long, multi-phase process, but six vaccines are already in phase III of trials. Developing an effective vaccine will certainly be a huge accomplishment, but drug companies fear manufacturing billions of doses may be the biggest challenge of all. Plus, learn the phrasal verb “line up.”

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COVID-19 vaccine race is heating up | Learn the phrasal verb ‘line up’ 22:28 Share

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COVID-19 vaccine race is heating up | Learn the phrasal verb ‘line up’