求翻译：2GR-FSE发动机上配备了更为先进的D4-S技术，它除了一组伸入气缸内部的喷油嘴外，还安装了一套传统的进气歧管喷油嘴。在低负荷工况时，歧管喷油嘴在进气行程时喷油，混合气进入气缸，再配合压缩行程时气缸内喷油嘴喷油，从而实现分层燃烧；高负荷工况时，只在压缩行程进行缸内直喷，从而提高发动机动力和经济性。是什么意思？

2gr-fse engine is equipped with more advanced d4-s technology, it is inserted into the cylinder inside the nozzle in a group, but also installed a set of traditional into the manifold injector. In the low load conditions, the manifold nozzle injector in the intake stroke, the mixture into the cylind