F1 tyres have an optimum operating temperature, and when they drop below that they rapidly lose grip, which dramatically slows lap times.
F1赛车的车胎对环境温度有要求，当温度低于底限时候轮胎就会失去抓地力，这会大大减慢圈速。
2
They work by absorbing extra thermal energy in the drink when it's too hot, and then releasing that stored energy back into the drink to keep it at an optimumtemperature as it begins to cool down.
金属咖啡豆的工作原理是在饮品温度过高时吸收多余热量，并在饮品开始冷却时释放储存的热量。
3
Do you know the optimumtemperature for the growth of plants?