scanning element meaning in English

像素，元像。

In a scanning system ( optical character recognition , cathode ray tube ) , the movement of the scanning element from the end of one scanned line to the beginning of the next
在扫描系统（光学字符认别，阴极射线管）中，光点从一行的末端到下一行的始端的运动。
In the proposed join algorithms , although some algorithms such as mpmgin algorithm [ 23 ] , outperform standard rdbms join algorithms , they perform a lot of unnecessary computation and i / o for matching basic structural relationships , especially in the case of parent - child relationships ; other algorithms such as the stack - tree - desc algorithm [ 24 ] , represent the state - of - the - art in structural joins , however , they do not utilize indexed structures but sequentially scan the input lists . thus , i / o ' s can be wasted for scanning element that do not participate in the join , and join speed can be influenced
另外，在所提出的算法中，尽管有的算法，如mpmgjn算法[ 23 ]优于标准的rdbms连接算法，但是该算法为匹配基本的结构关系，特别是在父子关系情况下，执行了大量不必要的计算和占用了大量的i / o资源；有的算法虽然代表了结构连接算法的先进水平，如stack - tree - desc [ 24 ]连接算法，但是它没有利用索引结构而是顺序浏览输入列表。