Complex Machinery

1. Telephone
We can call each other when we want. We can't always visit somebody and talk each other but by using telephone, we can call each other even we're in other countries. We can call each other for emergency rather than just wait for the help.

2. Clock
It's easier to know what the time is rather than looking at the sun. We can know the exact time so that we can go to the place in right time. Not too many, but sometimes, the beautiful clock can be used for decorations too.

3. Keyboard
We can't write something that is long by our hands, or it'll hurt very much and will waste too much time. But using keyboard is easier, faster and cleaner. Even some people who don't know how to use keyboard, they can learn it because it's easy. By using keyboard, we can also do the work that we can't do with a mouse, and also, we can send the mail to each other.