求翻译：随着排放法规和燃油经济性的要求不断提高，对柴油机的要求也越来越高，首当其冲的是柴油喷射技术。首先，为了降低燃烧噪声，要求预喷；为了使燃油燃烧充分、从气缸内降低排放和使微粒物捕集器得到再生，要求在主喷之后进行补喷。为了使燃油雾化得好，就要增加喷油孔的数目，缩小喷油孔的直径，但这会导致喷油速率的下降。如要保证足够的喷油速率，就要提高喷油压力。而为了实现多次喷射，就要改善喷油系统的响应特性。这些要求决定了共轨喷油技术的发展方向。是什么意思？

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As emissions regulations and fuel economy, increasing demand for diesel engines, there are increasingly high requirements, and the first to be affected is the diesel fuel injection technology. First of all, in order to reduce combustion noise, called pre-injection; in order to make the fuel oil from