求翻译：据日产官方的说明，他们表示缸内直喷的系统结构比较复杂，而且主要是应对于较大排气量的引擎；而小排气量的引擎碍于空间不足，所以不适合配置缸内直喷系统。这套双喷油系统，刚好可以让小排气量的引擎有如同缸内直喷的燃烧效率及经济性。是什么意思？

According to Nissan official description of the structure of the direct injection system is more complex, but mainly the larger displacement engine; small displacement of the engine due to lack of space, it is not suitable configuration cylinder straight spray system. Set of dual-fuel injection syst