产生加工误差的原因有哪些？

    Today people can use the phone to talk with others almost anywhere on the earth. But    1   you use the
phone, you can't see the person you are talking with. That   2   change in the future.
Now some people are using a kind of telephone called the picture phone or a vision phone (视频电话). Two
people   3   are talking can see each other with it.
    Picture phones can be useful when you have   4   to show the person you are calling. They may have other
uses in the future. One day you may be able to ring up a   5   and ask to see a book. Then you'll be able to   6   
the book over your picture phone. Also you may be able to do shopping through your picture phone. If you
see something   7   the newspaper that you want to buy, you can   8   the shop. People at the shop will show
you the thing you're   9   in over the phone. You'll be able to shop all over the town and never even leave your
room.
    The picture phone is really a  10  phone. More and more people will use it.