II 源代码

(WB) I'm going to talk about a train that exemplifies the rise and fall of passenger trains in the United States: the Twentieth Ce…

(WA) Before moving on to a new topic, I want to finish up our unit on arachnids by looking at what may seem a very unusual aspe…

(MA) Scientists are always on the lookout for alternative sources of energy. Today we're going to discuss one that's so plentiful…

(WA) The next style of furniture design I'd like to discuss is Shaker furniture design. The Shakers are a religious group that flo…

(WA) Well, in answer to your question, several women actively participated in the Civil War. The one that comes immediately to min…

(MA) As you probably know, log structures are gaining in popularity. They are no longer just the simple country homes that we thin…

(MA) We're going to start today talking about congressional aides, that is, the people who work for our congressional representati…