fluid (medium)
英
美
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名词 fluid:
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a substance that is fluid at room temperature and pressure
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continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas
形容词 fluid:
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subject to change; variable
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characteristic of a fluid; capable of flowing and easily changing shape
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smooth and unconstrained in movement
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in cash or easily convertible to cash
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affording change (especially in social status)