In the future, some people want to put thermoelectric materials under the roads.

将来，有人想把热电材料铺在马路下面。

The second is to choose a thermoelectric material which conducts heat badly (so that different parts remain at different temperatures) but electricity well.

第二是选择的热电材料的导热性差（这样不同部分就能保持不同的温度）但是导电性良好。

The reason thermoelectric materials have not, in the past, been applied successfully to the question of solar power is that to get a worthwhile current you have to have a significant temperature difference.

为什么在过去热电材料没能成功地应用到太阳能上呢，这是因为如果要获得有价值的电流必须有巨大的温度差。