why sid cannot install openoffice?

[Star Liu <minxinjianxin@gmail.com>]

here is the error message:
StarLiu:~# i openoffice.org-writer
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  openoffice.org-writer: Depends: openoffice.org-core (= 1:3.0.1-4+b2)
but it is not going to be installed
                         Depends: openoffice.org-base-core (=
1:3.0.1-4+b2) but it is not going to be installed
                         Depends: libicu38 (>= 3.8-5) but it is not installable
                         Recommends: openoffice.org-filter-binfilter
but it is not going to be installed
                         Recommends: openoffice.org-writer2latex but
it is not going to be installed
                         Recommends: openoffice.org-emailmerge but it
is not going to be installed
                         Recommends: openoffice.org-math but it is not
going to be installed
E: Broken packages


-- 
My platform is AMD64 with Debian sid and gnome.