所谓“单认证”是指我国内地有关机构出具的涉外公证书或其他证明文书在送往国外使用前只需办理我国外交部领事司或其委托的地方外办的领事认证，文书使用国即可接受该文书。

The so-called ‘single authentication’ refers to the consular authentication by the Consular Department of the Ministry of Foreign Affairs of China or its authorized local foreign affairs office, which is required for foreign-related notarization certificates or other certification documents issued by relevant institutions in mainland China before they are used abroad. Once the consular authentication is completed, the document can be accepted by the country where it is to be used.