Indoor pollution, which includes sources like homeheating and cooking, has remained constant over the past several decades despite advances in the area.
在过去几十年中，来源于诸如家庭供暖和烹饪等的室内污染持续存在，尽管在这方面已经有所改进。
2
Hot water boilers (homeheating system).
热水锅炉(家用取暖系统)。
3
They are finding their favorite breakfast stands closed, and coal for homeheating now unavailable.