i will invent a time machine in the as it 's been my dream in my life. timemachine allows people to travel back in time to prevent disaster to happen.
it also allows people to tavel into dinstant future to find out solutionfor incurable illness including cancer and aids. however, this machine may beabused by people to create chaos in our world or even completely change ourhistory. therfore, security features are essential for my invention.
the future invention of time machine will definately bring more advantagesfor human being.