英语语法分析

Place the key in /etc/ssl/certs/stunnel.pem.

将密钥放置在 /etc/ssl/certs/stunnel.pem。

They are in the certs directory of the source tree.

它们位于源文件树的 certs 目录中。

There is also a subfolder under certs with expired certificates.

在certs目录下，还有一个存放过期证书的子目录。