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limescale

noun
/ˈlaɪmskeɪl/
/ˈlaɪmskeɪl/
[uncountable] (British English)
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  1. the hard white substance, mainly consisting of calcium carbonate, that is left by water on the inside of pipes, etc.(管道等内的)水垢
limescale
Products of chemical reactions and processes: crystal, dioxin, distillate...

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