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 Because it was slow and difficult for them to travel then.

 Today a letter from Australia gets to China by airplane.

There are a lot of changes in our life. Then, if we wanted to buy something, we had to go

to shops. We always had lessons in the classroom. And we used the keys to open the doors.

Now we can do shopping on the Internet. We can have lessons on the Internet too. And we

have electronic locks. We can open the doors with our fingerprints.