There are limitations to what humans can do.
We cannot hear or see things which are tiny, too soft or well-hidden.
We cannot fly or walk very fast or too far without the aid of technology.
Human are able to overcome their limitations by using devices.
1. We can used telescope, magnifying glass and microscope to
see the fine details of an object.
( A )Telescope
( B ) Magnifying glass
( C ) Microscope
2. We can used telephone, megaphone and
microphone to speak loud enough for someone.
( A ) Telephone
( B ) Megaphone
( C ) Microphone
3. We used train, car and aeroplane to walk long distance.
( A ) Train
( B ) Aeroplane
( C ) Car