| 释义 |
第二级 Dì Èr Jí
基本例句
secondary
用来查找特定文件记录的一对索引中的第二级索引。高一级的或涉及量大的索引通称为粗索引。Asecondaryindex in a pair of indexes used to locate a particular file record. The higher or mass index would often be considered the coarse index.
焦炭，煤气和汽油是更加有效地利用煤和石油的第二级燃料的范例。The gas and petrol are examples ofsecondaryfuels by which coal and oil may be more effectively used. |