The problem is the low thermal conductivity of air.

问题在于空气的热导率很低。

youdao

Ceramic substrade, High efficiency and low thermal resistance.

高光效、低热阻陶瓷基板。

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With a strong plasticity, low thermal conductivity, resistance to high temperature, etc.

具有强大的可塑性，导热系数低，能够耐高温等特点。

youdao

The second desideratum, of low thermal and high electrical conductivity, was achieved by dividing the bismuth telluride into pellets a few nanometres across.

ECONOMIST: Solar power

Factor in the Kepler architecture's great efficiency and low thermal design power and the GTX 660 Ti assures gamers of having the most stable, quiet and power-efficient gaming experience possible in its price class.

ENGADGET: NVIDIA announces $299 GeForce GTX 660 Ti, lets Kepler walk among the people

Solar thermal energy is low cost and easy to collect, and 100% efficient.

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