- Based on the working principle,the piezoelectric pump with active valve was designed and fabricated which used the piezoelectric vibrators as the prime mover and the inlet and outlet valves.
- The orient has been playing an active role in the world economy.
- He is an active member of the school's stamp club.
- Have you turned off the water valve?
- An active volcano may explode at any time.
- Is it wise to engage in active sports at your age?