最后一部分对全文进行了一个总结，指出了一些文章中由于客观原因存在缺陷以及有待进一步解决的问题。
Final part summed up the whole essay and point out existing defects because of objective factors and the problem to be further resolved.
传统的滤波反投影算法(FBP)要求完备的投影数据，而实际检测中往往由于客观原因无法获得完全的投影数据。
Traditional filtered backprojection (FBP) method required complete projection data, which were often difficult or even impossible to acquire for objective reasons.
2002年中，由于一些客观原因，江中药业寄予厚望的新产品被延期上市。
In 2002, due to some objective reasons, the industry's high hopes in the new products were delayed listing.
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