换高速挡，改进…以适应提高生产的需要，使做好行动准备...

When you are going fast enough, you'll be able to gear up.车开得足够快时, 你就能换挡加速.We'd better gear up ( the car ) if we are to arrive at the airport before six.如果要在六钟以前到达机场,我们得加快 车速.Now the country needs to gear up th...

gear up的音标：gear up的英式发音音标为：[ɡiə ʌp]gear up的美式发音音标为：[ɡɪr ʌp]...