填空题

How hard is it to get beautiful hair
Beautiful hair cannot be taken for granted. Environmental factors, chemical treatments and the mechanical damage done by combs, brushes and blow dryers all have a bad effect on the hair in the long run. The hair parts into thin pieces, loses its brightness, be- comes hard and easily broken and develops split ends.
Our Heated Scissors (剪刀), a new approach to pretty hair, is a modern technological device available in most cities now.
No hairdresser(美发师 needs to be told how crucial the quality of a pair of scissors is. But all the same, few have imagined a cutting tool as sharp as razors (剃须刀). What’s more, the heating element is located in the interior of the edges, with the best possible heat transference to the cutting edges. Heated cutting edges with individually adjustable temperatures seal the cuts instantly. The cut end of the hair is closed up smoothly and neatly.
Right from the very first cut, the hair takes on a new look with a brilliant shine. What is the special function of the new device It will ______ the cuts instantly.