Pots, pans, and casseroles should be heavy-bottomed so they will not tip over, and good heat conductors so that foods will not stick and scorch.
无论是深底锅，平底锅还是焙盘都应该有很厚的底，这样才不容易翻倒，而且导热要好，这样食物才不会粘锅或是煮焦。
Liquids, which contains no free electrons, are poor conductors of heat.
各种液体，由于不含有自由电子，是热的不良导体。
But nanotubes have other qualities that are whetting the appetites of engineers: they're excellent conductors of electricity and heat, and they can be used as wires, semiconductors or superconductors.
但是纳管还具有其他的品质，吊起了工程师们的胃口：它们是电与热的优良导体，可以用作电线、半导体或超导体。
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