water-softener

n [C, U] device or substance that softens hard water 硬水软化器; 软水剂.

water-cooled, water-diviner, water-fowl, water-hammer, water-hole, water-ice, water-jump, water-level, water-lily, water-line, water-main, water-meadow, water-melon, water-mill, water-pistol, water-power, water-rat, water-rate, water-ski, water-skiing, water-spout, water-supply, water-table, water-tight, water-tower, water-vapour, water-wheel, water-wings, watercourse, watercress, watered silk, waterfall, waterfront, watering-can, watering-place, waterless, waterlogged, Waterloo, waterman, watermark,