The other is your hand would occlude what you wanted to see, and the third, which was the winner, was that your fingers would get the screen dirty, and hence, fingers would never be a device that you'd use.
Outra era que a vossa mão ocultaria  o que queriam ver, e a terceira, que era a vencedora, era que os vossos dedos  sujariam o ecrã. (Risos) Por isso, os dedos nunca seriam um dispositivo a utilizar.