Those days I'm busying to translate documents about our products. And I'd like to say some of my method and hope it's useful to you. First I'd like to commend two websites, one is a good translation website especially for transfer the industry documents,another is a good English--English dictionary,for from the chinese means, two or more words are the same,but in English you could find differents and also know how to use them.http://dict.cnki.net/ and http://www.thefreedictionary.com/ In order to translate idiomatic English,first you must know the real means of the docments sentence by sentence. And just express every sentence meanings is ok. Don't translate word by word. In Chinese one sentence can translate into two sentences or more sentences and vice verser. To translate technical words,you must be careful and find more by different means,for example,by google or others.