1. A machine-implemented method, comprising: maintaining, in a translation quality assurance system, a translation dictionary matching a source language to a target language; mapping automatically with the translation quality assurance system a sentence pair having a source sentence in the source language and a target sentence in the target language at a linguistic level using the translation dictionary; identifying an unmapped word as a compound word if an unmapped source word has a translation that is a prefix of the compound word; and generating automatically with the translation quality assurance system a translation quality report describing a translation quality of the sentence pair.