In recent years there are many central air conditioning systems running in our country.
近几年，我国有许多大型舒适性中央空调系统投入运行。
To protect the art, some are putting in new air-conditioning systems.
为了保护艺术品，有些博物馆安装了新的空调系统。
It can save a lot of energy to preheat air in air-conditioning systems.
在空调系统中对空气进行预热，可以节约大量的能源。
It can save a lot of energy to preheat air in air-conditioning systems.
在空调系统中对空气进行预热，可以节约大量的能源。
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