Because the CD that we cannot see, then we should be doing to benefit by bringing the invention is used by making a clock and also use their spare time to benefit and can also act as a supplementary income as well.
The CD that we can not see it I'm so we should be getting benefits by adopting the invention is for use by the making watches and also takes time to implement, and can function as a finding. with extra income
Because the CD we cannot see it, so we should bring the benefit to ระดิษฐ์ cause for the clock and is also a time to benefit, and also can do to earn extra.