1. Certain measures, however, are more important than others and are based on units that may not be found in any standard conversion table. 
   不过，某些度量单位要更重要一些，而且在任何标准的转换表里恐怕都找不到。
2. direct frequency conversion circuit 
   直接变频电路
3. indirect frequency conversion circuit 
   间接变频电路
4. The ratio of the width to the height of an electronic image. For broadcast television, the standard aspect ratio is4∶3. 
   一幅电图象的长宽比。广播电视的标准是4∶3。
5. Exchange table, conversion table 
   汇兑换算表

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• 1. 电视制式转换
  television spot 电视插播公告; 电视插播节目...television standard conversion电视制式转换...television standard conversion 电视制式转换
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