引言：
“一人留 两人疚 三人游~”
fluid /ˈfluːɪd/
noun
[可数名词, 不可数名词] 液体；流体；液
a liquid; a substance that can flow
body fluids (= for example, blood)
体液（如血液）
The doctor told him to drink plenty of fluids.
医生要他多喝流质。
adj.
1.
(formal)of movements, designs, music, etc. 动作、设计、音乐等流畅优美的
smooth and elegant
a loose, fluid style of dancing
灵活流畅优美的跳舞风格
fluid guitar playing
流畅优美的吉他演奏
the fluid lines of the drawing
图画的流畅线条
2.
(formal)of a situation 形势易变的；不稳定的
likely to change; not fixed
a fluid political situation
不稳定的政治局势
3.
(technical 术语)流动的；流体的
that can flow freely, as gases and liquids do
a fluid consistency
流体黏稠度
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