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dirty or unfit for use
People in big cities in China often wear protective masks because the air is contaminated with pollution.
people who take action in support of a cause
Activists marched through the city’s streets to demand higher salaries for workers.
full of danger; risky
Firefighters often find themselves in perilous situations when battling a blaze.
likely to be harmed or affected by a particular thing
People who spend time in the sun without wearing sunscreen are susceptible to getting a sunburn.
countries that support one another, especially during a war
For decades, the United Kingdom has been one of the closest allies of the United States.
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