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adj. having more than a basic knowledge of sth. but not yet advanced;
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n. a person whose job is repairing machines, especially the engines of vehicles
n. trees that are grown to be used in building or for making things; v. to move in a slow, heavy and awkward way;
n. a toilet, or a room with a toilet in it
adj. too important to be without; absolutely necessary, not to be neglected
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