Abroad, world-famous landmarks including the Pyramids, the Eiffel Tower and Beijing's Forbidden City will go dark, with thousands of towns and cities in 125 countries promising to take part.
Clay bricks have been forbidden in most cities, which require the appearance of new wall block.
粘土砖在我国大部分地区已禁用，迫切要求新的墙体材料的出现。
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In order to protect environment, nowadays many large and medium-sized cities in China have forbidden the use of small coal-fired boilers, which is a blow to most of bath centers.