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单词 water softener
释义

WordReference Random House Unabridged Dictionary of American English © 2024
water sof′tener, 
  1. Chemistryany of a group of substances that when added to water containing calcium and magnesium ions cause the ions to precipitate or change their usual properties: used in the purification of water for the laboratory, and for giving water more efficient sudsing ability with soap.
Also called softener. 
Collins Concise English Dictionary © HarperCollins Publishers::
water softener n
  1. any substance that lessens the hardness of water, usually by precipitating or absorbing calcium and magnesium ions
  2. a tank, apparatus, or chemical plant that is used to filter or treat water to remove chemicals that cause hardness
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