Double wall vacuum-insulated keeps water hot while saving energy and money.
双层真空隔热保持热水，同时节省能源和金钱。
2
And a panel encasing a vacuum is one of the best insulators known. But vacuum-insulated panels are too pricy for widespread use.
有一款真空隔热板是迄今为止最好的，但其造假昂贵，不利于普及使用。
3
This paper discusses and analyzes any efficiency through vacuum treating at the moderate temperature on the stator coils insulated with epoxy micapaper tape of H. V. electrical machine.