利用卷积反投影算法对图像进行重建时，要降低成本，提高成像效率，就必须选取合理的抽样间距和投影数。
It is important to select suitable sampling space and projection data for reducing cost and improving the image reconstruction efficiency in convolution backprojection algorithm.
在文化变迁的过程中进行民族文化保护，从本质上说，就是要保持或者重建这个民族的文化自尊。文化自尊是民族文化保护的内在动力。
The essence of the protection of an ethnic culture in the process of cultural changes is the maintenance or reconstruction of its cultural self-esteem which is the internal motive.
根据国际奥委会所说的，要重建奥运声誉，现在我们已经将检查的比例增加了25%，而且在更多的时间段进行抽查。
As IOC said in the build up to the games, due to the fact that the testing has been increased by 25 per cent here in Athens compared with Sydney, it's been extended over a wider period of time.
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