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n. a form of air pollution that is or looks like a mixture of smoke and fog, especially in cities
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v. to begin sth. again after a pause or an interruption
n. Einstein's theory of the universe based on the principle that all movement is relative and that time is a fourth dimension related to space
v. to obtain sth. , especially sth. good, as a direct result of sth. that you have done; to cut and collect a crop, especially wheat, from a field
vt. to remove or reduce an unpleasant feeling or pain
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