Englishfor English speakers
extraction
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noun
the action of taking out something (especially using effort or force)
the dentist gave her a local anesthetic prior to the extraction
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noun
the process of obtaining something from a mixture or compound by chemical or physical or mechanical means
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noun
(= origin)
properties attributable to your ancestry
he comes from good origins
valve
Noun
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A valve is part of a tube that lets liquid or gas go through one way but stops it from going through the other way.
There are four valves in the heart that let blood go in one direction but stop it from going in the other direction.
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A valve is part of a tube that someone can open or close to let water or other things go through.
Open this valve to let water go through the pipe.