The system produces most of its hot water, but if more is needed, or if the temperature is not high enough, the house has a supplemental, solar-powered water heater.
该系统产生的热水大多数，但如果有更多的需要，或者如果温度不够高，房子有一个补充，太阳能热水器。
Therefore, in addition to large hot water system or need high water temperature of the situation, the only choice of circulating, most commonly with mandatory nature of circulating water heater.
因此，除大型热水系统或需要较高水温的情形，才选择强制循环式，一般大多用自然循环式热水器。
Objective The influence of high temperature environment to human body is wide, including hot metabolism, energy metabolism, water salt metabolism, neuroendocrine system, cardiovascular system and so;
目的高温环境对人体生理功能的影响是广泛的，包括热代谢、能量代谢、水盐代谢、神经内分泌系统、心血管系统等；
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