题目内容
n. an area of work or study that sb. gives most of their attention to and knows a lot about;
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n. an area where people live that is outside the centre of a city
n. a reddish-brown substance that is formed on some metals by the action of water and air
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
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