hwo to install the "WINE"???? problem

gootoo

$ sudo apt-get install wine
Reading package lists... Done
Building dependency tree... Done
Package wine is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package wine has no installation candidate

windwiny

debian.ustc.edu.cn/debian testing

apt-get update
apt-get install wine