zhou replied china is tackling safety measures at nuclear plants constantly aiming at higher levels of safety. >> translator: japan learns serious lessons from the the fukushima accident. we'd like to share what we learned with the world as much as possible. >> hosono also said cooperation with china will be very important since the country's increasing the number of its nuclear power plants. >>> a fuel efficient jet engine developed for the mitsubishi regional jet or mrj was unveiled in the u.s. state of connecticut. the plane will be japan's first domestically developed small passenger aircraft in 50 years. the small sized jetliner is being developed by mitsubishi aircraft corporation, a subsidiary, with the support of a japanese government. u.s. aviation women maker pratt & whitney says the engine which measures 1.9 meters in diameter is 20% more fuel efficient than existing models. >> the combination of good fuel efficiency, low noise, low cost of operation of the airplane, and passenger comfort will make mitsubishi very successful. >> the company has been flight testing the engine