求翻译：约自公元1世纪,中国东汉时,砖石结构有所发展（见中国古代石结构、中国古代砖结构。在汉墓中已可见到从梁式空心砖逐渐发展为券拱和穹窿顶。根据荷载的情况，有单拱券、双层拱券和多层券。每层券上卧铺一层条砖，移为“伏”。这种券伏相结合的方法在后来的发券工程中普遍采用。 自公元4世纪北魏中期，砖石结构已用于地面上的砖塔、石塔建筑以及石桥等方面。公元6世纪建于河南登封县的嵩岳寺塔,是中国现存最早的密檐砖塔。是什么意思？

Since about the 1st century AD, the Chinese Eastern Han Dynasty, brick structure was developed (see China's ancient stone structure, China's ancient brick structure has been in the tomb can be seen from the beam gradually developed into hollow brick arch and dome top coupons, according to load case,

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About since the 1th century AD, when the Chinese Eastern Han dynasty, masonry has evolved (see stone structures in ancient China, ancient Chinese brick structure. Is visible in the Han tomb for coupons from the progressive development of the beam-type hollow brick arches and fornix. According to the

Made an appointment since the 1st century, in Chinese the Eastern Han Dynasty, the structure of bricks and stones was developed to some extent (see China's ancient stone structure, China's ancient brick structure. Can see hollow brick develop into certificate push gradually and dome carry from roof