数字证书是一个文件，它绑定了一个带识别码的公用密钥(一个用户或者一个组织)。
A digital certificate is a file that binds a public cryptographic key with an identity (a user or an organization).
一种带二维码识别的文件袋，其特征在于，主要由文件袋1和二维码识别标志2组成，二维识别码标志2固定于文件袋1上。
The file packet with two-dimensional code recognition is characterized by mainly consisting of a file packet 1 and a two-dimensional code recognition mark 2 which is fixed on the file packet 1.
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