fluid adj.

VERBS be | become | remain | keep sth I think we should try and keep our arrangements fluid at this stage.

ADV. extremely, highly, very It's a highly fluid situation. | fairly, quite, rather, relatively

fluid noun

ADJ. excess | amniotic, bodily/body, intravenous | brake, cleaning

VERB + FLUID drink Change your diet and drink plenty of fluids. | lose | replace replacing vital body fluids and salts that are lost when you sweat | retain Retaining excess fluid could be a problem.

You can also check Google Dictionary: fluid (English, 中文解释 )

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