其次是更年轻的飞机的发动机效率更高。
The second is that a younger fleet offers greater engineering efficiency.
其次是在压力过大的时候应用这技术，并且作为一个有效率的复制途径来使用。
The second is to apply this technique in times of heavy stress and use it as an effective coping mechanism.
混合动力汽车是一个很有前途的有效改善燃油效率的替代方案，其次是电动车。
The hybrid vehicle is a very promising alternative option for significantly improving fuel efficiency, followed by the electric vehicle.
应用推荐