Some work for equipment manufacturers, such as the makers of heating and air conditioning systems, and they travel to installation sites to upgrade or modify those systems.
有些工作者服务于设备如电暖气和空调的制造商。他们还要出差到安装了系统的地方，为他们更新或改进已安装的系统。
Some work for equipment manufacturers, such as the makers of heating and air conditioning systems, and they travel to installation sites to upgrade or modify those systems.
有些工作者服务于设备如电暖气和空调的制造商。他们还要出差到安装了系统的地方，为他们更新或改进已安装的系统。
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