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cool：n.凉爽，凉爽的空气；adj.凉爽, 冷静的，无所顾虑的，淡漠的；v.使冷，使镇定。cold：n.寒冷，[物]零下温度，伤风，感冒；adj.寒冷的，使人战栗的，冷淡的，不热情的，失去知觉的。
词语辨析
cold、cool、freezing、chilly、lukewarm、tepid
All these words describe sb/sth that has a low temperature. 以上各词均表示温度低。
cold
having a temperature that is lower than usual or lower than the human body; (of food or drink) not heated; cooled after being cooked 指寒冷的、冷的，（食物、饮料）凉的、冷的：
I'm cold. Turn the heating up.
我觉得冷，把暖气温度调高一点。
Outside it was bitterly cold.
外面非常寒冷。
a cold wind
寒风
hot and cold water
热水和凉水
It's cold chicken for lunch.
午餐吃鸡肉冷盘。
cool
( often approving ) fairly cold, especially in a pleasant way 指凉爽的、凉快的：
a long cool drink
一大口冷饮
We found a cool place to sit.
我们找了一个凉快的地方坐下来。
freezing
extremely cold; having a temperature below 0˚ Celsius 指极冷的、冰冻的、冰点以下的：
It's absolutely freezing outside.
外面冷得不得了。
I'm freezing!
我要冻僵了！
chilly
( rather informal ) too cold to be comfortable 指寒冷的、阴冷的：
Bring a coat. It might turn chilly later.
带件大衣，过一会儿天气可能会变冷。
lukewarm
( often disapproving ) slightly warm, sometimes in an unpleasant way 指微温的、不冷不热的、温吞的：
Her coffee was now lukewarm.
她的咖啡变得微温。
tepid
( often disapproving ) slightly warm, sometimes in an unpleasant way 指微温的、不冷不热的、温吞的：
a jug of tepid water
一壶温水