Indoor pollution, which includes sources like home heating 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
We'll now look at another ceramic which is made from mixing sand with minerals and heating to over 600 degrees Celsius.
现在我们来看看另一种陶瓷，它是由沙子和矿物质混合，再加热到600多摄氏度制成的。
3
Over-heating because of the extra warmth generated by sleeping beside another person may be just as blame worthy for a sleep-deprived night as other factors.