我可以显示该目录中的内容，因为已经设置了它的用户读位。

I can display the contents of the directory because its user-read bit is set.

youdao

每个权限集中都有三个访问位：读、写和执行。

Within each set, you have three access bits: read, write, and execute.

youdao

接下来的三位(用绿色表示的)表示组对该文件的读、写和执行权限。

The next three bits (in green) represent a group's right to read, write, and execute the file.

youdao