题目内容
n. a reddish-brown substance that is formed on some metals by the action of water and air
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n. the normal order and way in which you regularly do things; a. done or happening as a normal part of a particular job, situation or process
a. that has decayed and cannot be eaten or used
n. a leather seat for a rider on a horse
n. a number of people or things that follow each other in time or order; the regular pattern of one thing following another thing
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