Another way to check the amount of free space in an external snapshot is to mount the image and use the df command.

检查外部快照中的空闲空间量的另一种方式是，挂载映像并使用df命令。

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Both convolution Backprojection (CBP) method and direct-Fourier (DF) reconstruction method are the representative algorithms of transform methods in image reconstruction.

卷积反投影(CBP)与直接傅立叶重建(DF)同是图像重建中变换法的典型算法。

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