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Heat rash rises on his back.
他背上起痱子了。
《新英汉大辞典》
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It's just a little heat rash, there is nothing to worry about.
只是小小的热疹，没什么可担心的。
youdao
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The heat brought him out in a rash.
炎热的天气使他浑身长满了痱子。
《牛津词典》
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The heat brought him out in a rash.
炎热的天气使他浑身长满了痱子。
《牛津词典》