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问题: Oh,it was back in 1853

初三英语书的第九单元有一段听力中有这样一段话
Here on the bag it says that were invented by a chef called George Crum
when was that?
Oh,it was back in 1853.
这里的 back 是什么意思?

解答:

Here on the bag it says that were invented by a chef called George Crum
意思是:袋子上写着它是又一个叫做George Crum 的厨师发明的.

when was that?
Oh,it was back in 1853.
那是什么时候的事情呢?
哦,得追溯到1853年

back在这里的意思就是以前;追溯
例如:A few years back you could see nothing but barren land there.
数年前人们在那儿所能看到的只是荒野。