mikelove said:They're really completely different - the ABC is a large (200,000-entry), comprehensive Chinese-to-English dictionary, while the C&T is a very short English-to-Chinese dictionary focused specifically on business vocabulary. The ABC will likely make a much bigger difference in your use of PlecoDict than the C&T will, simply because it adds so much more vocabulary, so the main reason to get the C&T in addition to it would be if you need to look up the Chinese versions of business terms like FOB and disintermediation.