Besides, keeping track of all the numbers can be enough to drive some people up a tree. 是什麼意思

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Hello.

Ah, that term is just an expression, just like "break a leg" means "go do your best!" It doesn't really make sense, even in English, unless you know that phrase.

So basically, the sentence "Besides, keeping track of all the numbers can be enough to drive some people up a tree" just means "keeping track of all of the numbers can really annoy people" or "...can really drive people crazy."

Hope that helps. :)