#noun#unit10#level4
particle [ˈpaːrtikl] n.
A particle is a very small piece of something.
→ The bottles of wine were covered in a layer of dust particles.
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#verb#unit10#level4
refrain [riˈfrein] v.
To refrain from something is to avoid doing it.
→ The doctor asked Mary to refrain from eating fast food as part of her diet.
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#noun#unit10#level4
review [riˈvjuː] n.
A review of something is a formal inspection of it by people in authority.
→ The government ordered a careful review of the economic situation.
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#adjective#unit10#level4
sophisticated [səˈfistəkeitid] adj.
If someone is sophisticated, they know many things about the world.
→ Jake is one of the most sophisticated persons I’ve ever met.
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#verb#unit10#level4
surrender [səˈrendər] v.
To surrender something is to give it up.
→ The thief surrendered the money to the police when he was caught.
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