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[音频]a part of a field of activity, esp. of business, trade, etc.

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[音频]form or arrange in levels or parts within a system or set of ideas

[音频]working or continuing in the normal or usual way

[音频]a possible course of action, etc. so that one can study it before dealing with the real thing

[音频]create a copy of an activity, a situation, etc. so that one can study it before dealing with the real thing