Traditional approaches to CLS are based on the pipeline paradigm, which either first translates the original document into target language and then summarizes the translated document (Leuski et al., 2003) or first summarizes the original document and then translates the summary into target language (Lim et al., 2004;Orasan and Chiorean, 2008;Wan et al., 2010).
the current machine translation (MT) is not perfect, which results in the error propagation problem.