Assign a name for the file where the retrieved image will be stored.

为保存所检索到的图像使用的文件分配一个名字。

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Use the saved Message Digest signature (see step 2, above) to verify the integrity of the retrieved image.

使用保存的Message Digest签名(参见上面的第2步)检查接收到的映像的完整性。

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The lives lost cannot be retrieved, but there's still a chance to keep a positive image.

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