Why must Human-being have sweat?

Although I said considerable previously this thing of being as next in then Human-being is only life form on this Earth which must have sweat with in order for taking cool down temperature of its body. On normal evolution process which is thought commonly by usual people who are intentionally attentionless in then can matter of as like as of this exist?
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作家 :: 生賴範義:NORIYOSHI OHRAI :: 果しなき流れの果に 角川文庫版:End of endless stream