所谓“流体”是指可流动的物质。
物质具有抵抗流动的性质。
The resistance offered by any material to its ability to flow.
任何物质对电子的流动都有阻力。
There is not a single substance but has resistance to the flow of electrons.
空气是气态物质其特点是流动性。
Air is the gaseous state of matter whose characteristic is mobility.
所谓“流体”是指可流动的物质。
导体：任何允许电流和热能流动的物质。
Conductor: Any of various substances that allow the flow of electric current or thermal energy.
导体：任何允许电流和热能流动的物质。
Conductor: Any of various substances that allow the flow of electric current or thermal energy.
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