……
M: Oh, very much, very much. The Cambridge Science Park was developed here with new industries linked to the science side of the university. A growth phenomenon. "The Cambridge phenomenon" they call this.
W: This is astonishing --- this one with this structure on the top.
M: They sometimes call this "the Bridge of Sighs."
M: And this is one of the very earliest developments of Cambridge on this side of the river.
W: Ah.
M: Well, there are only two colleges like this which have a choir school attached --- St John's and King's. And the choir school is over in that direction. You see the little boys coming down with their top hats and black coats.
我想问，最后一段中的“there are only two colleges like this which have a choir school attached ”，是说这两所大学是有着和前文所说一样的连拱桥结构，还是指这两所大学也是最早的建筑之一，或者是别的？请指教。