Among them: flowerpots whose color warns when the soil is drying out, blackboards using water instead of chalk that could be erased by a pulse of heat, and even cars that change color in the rain.
其中包括：当土壤正在变干之时，凭颜色发出警告的花盆；用水笔代替粉笔写字，用热脉冲可以擦除字迹的黑板；甚至包括在雨中变化颜色的汽车。
The boiling heat transfer gradually to the dumplings, and made with boiling water does not stop the change, make dumpling skin evenly, so not easy break cook.
沸水逐渐向饺子传递热量，并使之随着滚水不停翻动，使饺子外皮受热均匀，所以不易煮破。
If you put a frog into a pot of cool water and then slowly heat the water to boiling, the frog eventually dies because the frog is unaware of the temperature change.
如果你把它扔进一锅凉水然后再慢慢加热，因为没有觉出温度在逐渐升高，这青蛙会慢慢死掉。
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