A water softener is a device or substance which removes certain minerals, for example calcium, from water, so that it makes bubbles easily when you use soap to wash things. 净水器
noun [物质名词]软化剂;硬水软化器
It strongly evokes the smell of clean laundry after using fabric softener and tumble-dryer sheets. 它强烈地唤起了使用织物柔软剂和滚筒烘干机洗后的干净衣服的味道。