题目内容

[音频]make a low continuous sound

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[音频]having a strong belief that everything can be perfect, often in a way that does not seem to be realistic or practical

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

[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

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