The containers should be made of dark glass or fired clay. Containers made of iron or copper will ruin fats and oils.
容器应由深色的玻璃或陶瓷做成，因为铁制或铜制的容器会使油脂变质。
2
But as temperatures drop and the coal-fired power stations stoke their fires, residents in China's biggest cities are bracing for another dark and depressing winter.
但随着气温降低，燃煤火电厂烧旺炉火，中国大城市的居民面对的是又一个阴郁的冬天。
3
Pottery drum, also known as drum soil, clay is fired into the dark box, and then cast made of animal leather.