Some of the words that Americans now use come from the languages of their immigrants, particularly from the Germans. The basic meaning of “dumb” in both British and American English, is “unable to speak”. In the USA, it acquired a second meaning “stupid”,straight from the German “damn”(stupid), and this second meaning has now crossed the Atlantic to Britain.
Of course, there are some American words that are peculiar to the USA and are quite different from their equivalents in the rest of the English-speaking world. Here is a list of some of the most important.
谁翻译一下? 谢谢哦