Set the tray on top of the two cups, with the hot cup under one end and the cold cup under the other.

将托盘放在两个杯子的上面，热杯在一端，冷杯在另一端。

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Add four drops of red food coloring to the water above the hot cup and four drops of blue food coloring to the water above the cold cup.

从热杯子上方向水中加四滴红色食用色素，从冷杯子上方往水中加四滴蓝色食用色素。

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Need a way to cool that hot cup of coffee or tea?

你是否在寻找如何把咖啡或茶弄冷？

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"It's like holding a hot cup of coffee that you really want to put down but can't quite yet, " Wager said.

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We have reviewed or tested nearly every type of single-use hot cup on the market, but a viable alternative does not yet exist.

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Analogously, a hot cup of coffee will always cool down if left - it will never draw warmth from a room to heat back up.

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