汶川大地震 为防止汶川大地震形成的北川唐家山堰塞湖溃坝,中国四川省绵阳市已紧急疏散16万人。[http:--news.bbc.co.uk-chinese-simp-hi-newsid_7420000-newsid_7423200-7423261.stm BBC中文网]url=http:--news.bbc.co.uk-chinese-simp-hi-newsid_7420000-newsid_7423200-7423261.stm