液体可以包括诸如水的透明液体，并且染料可以包括诸如包含着色染料、分散的色素或其它着色介质的水基墨水的指示剂。
The liquid may comprise a translucent liquid such as water and the dye may comprise an indicator such as a water-based ink containing coloured dyes, dispersed pigments or other colouring media.
液体可以包括诸如水的透明液体，并且染料可以包括诸如包含着色染料、分散的色素或其它着色介质的水基墨水的指示剂。
The liquid may comprise a translucent liquid such as water and the dye may comprise an indicator such as a water-based ink containing coloured dyes, dispersed pigments or other colouring media.
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