Historians use a wide range of primary and secondary sources for their research.
历史学家在研究中使用大量的原始资料和二手资料。
Books written in the present day by historians are secondary sources.
现今历史学家写的书是间接来源。
One of the easiest solutions is to list the secondary sources in the main one.
最方便的解决方案之一是，在主源文档中列出辅助源文档。
In practice, it behaves as if the secondary sources were included in the main one.
实际上，它处理时就好象辅助源文档包含在主源文档中一样。
In this assignment, you should use at least two secondary sources in the revised version.
在这份作业中，你应该在修改版本中至少使用两笔二手的资源。
He must have come to know those philosophers through secondary or tertiary sources.
他一定是通过第二手或第三手资料了解那些哲学家的。
Could you check the Internet for sources of secondary data?
你能上网核实一下这些二手资料的来源吗？
Hydrogen energy is one of important secondary energy sources in 21st century.
氢能将是21世纪重要的二次能源。
Hydrogen energy is one of important secondary energy sources in 21st century.
氢能将是21世纪重要的二次能源。
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