历史学家在研究中使用大量的原始资料和二手资料。
Historians use a wide range of primary and secondary sources for their research.
阿尔当：你来研究裹尸布，试着找出有关它原始用途和使用方法的一切资料。
Ardant: : you study the Shroud. Find out anything you can about its original purpose and method of use.
最后按编码的概率分布对其进行优化，使用这种方法，压缩后资料的数据量仅为原始图象的5%左右。
By use of this method, the compressed data are only about 5 percent of the original in quantity.
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