sunstroke
noun [ U ] uk/ˈsʌn.strəʊk/ us/ˈsʌn.stroʊk/
中暑
an illness caused by spending too much time in strong heat and light from the sun
Someone who is suffering from sunstroke feels dizzy and has a high temperature, but does not sweat. 中暑的人会觉得头晕，发高烧，但不出汗。