The complete server certificate consists of two parts: a public key and a private key.
完整的服务器证书包括两个部分：公钥和私钥。
If the two don't match, the certificate is only suspect, not invalid.
如果二者不能匹配，就只有怀疑这个证书无效了。
The Type Certificate has a validity period of two years.
类型认证有效期为两年。
Certificate of acceptance of contract product quality signed by both parties in two copies.
由双方签署的合同产品考核验收合格证书一式两份。
One can choose to attend a certificate degree, which may only take two years.
人们可以选择参加学位证书，这可能只需要两年。
One can choose to attend a certificate degree, which may only take two years.
人们可以选择参加学位证书，这可能只需要两年。
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