coolern.
英 'kuːlə | 美 'kulɚ
中文n. 冷却器；清凉剂
词根词源
cooler (n.)1570s, "a vessel in which something is set to cool," agent noun from cool (v.). Meaning "insulated box to keep things cool" is from 1958. Slang meaning "jail" is attested from 1884.
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