Fill in each blank with a suitable word given below.
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The heat, which may result from sources such as solar heating or burning of fossil fuels, can be converted into electricity with a very36efficiency through a process known as thermionic conversion. Due to the many advantages that would have a system of this type which would be tradable37 a large scale, many efforts have been for more than half a century to try to develop a practical thermionic generator, with lttle luck.38 all attempts. However, such luck may change soon, 39 to a new design: an electronic thermal40. The thermionic generators used the difference in temperature 41a hot metal plate and a cold to 42 electricity. Basically, it creates a difference in electrical 43 between the hot plate and the cold. The44voltage drives an electric current,. 45 the need for movement of mechanical parts.
回答第（36）空
high
