人生欲求安全，当有五要。一是清洁空气，二是澄清饮水，三是流通沟渠，四是扫洒屋宇，五是日光充足。
There is a need for safety in life。 one is to clean the air， the other is to clear the water， the third is to circulate ditches， the fourth is to sweep and sprinkle the house， the fifth is to have sufficient sunlight。
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