Since the widespread advent of domestic hot water 70 years ago, their utility and profits have been eroded.
自从70年前家用热水广泛普及以来，它们的实用价值和利润都已降低。
Domestic hot water
原声例句
经济学人（汇总）
英语百科
Water heating
Water heating is a thermodynamic process that uses an energy source to heat water above its initial temperature. Typical domestic uses of hot water include cooking, cleaning, bathing, and space heating. In industry, hot water and water heated to steam have many uses.
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