can n.
1 A usually cylindrical metal container.
2 An airtight container, usually made of tin-coated iron, in which foods or beverages are preserved.
3 The contents of such a container.
4 Slang. A jail or prison.
5 Slang. A toilet or restroom.
6 Slang. The buttocks.
7 Slang. A naval destroyer.
What those people are trying to tell you is that a good program that does that is something you might write as a university thesis. In other words, it's extremely difficult.
But if you don't mind if you have a very bad program, you could set up a dictionary that mapped English words to Spanish words, then translate each word in the sentence.