我刚读了一篇关于Docker的THIS文章,这篇文章描述了如何将一个简单的应用程序停靠.执行以下命令：

$docker run -t -i ubuntu:14.04 /bin/bash,

然后,给出以下解释：

Here we’ve again specified the docker run command and launched an
ubuntu:14.04 image. But we’ve also passed in two flags: -t and -i. The
-t flag assigns a pseudo-tty or terminal inside our new container and the -i flag allows us to make an interactive connection by grabbing
the standard in (STDIN) of the container.

我不明白其含义：

-i flag allows us to make an interactive connection by grabbing the standard in (STDIN)

谢谢.