Hi CLIPER,

Sorry for late reply.
Currently, I haven't found the translation service using web service technology.

But I found an alternate way, you can send the query against URL (REST) to http://dict.longdo.com and extract results from returned HTML.

E.g. If you want to translate a thai word, "คอมพิวเตอร์", to English, you can just send the query to the URL as "http://dict.longdo.com/search/คอมพิวเตอร์" and you will get back some results in HTML format.

From the results, you need to extract the results in "<td>" tag manually.

P.S. If I find a better service, I will tell you again.

Good luck