Aussi can also mean 'that'?
Yes, I would like a bit more info about what role "aussi" is playing in this sentence.
The "aussi" is linked with the "que" and together, "aussi ... que" means "as ... as"
"Aussi" is like the English "also" in that it links and compares things.
boîte also means can. not just box.
I'm pretty sure boîte can also mean 'night club', but that might be slang...
Yes, boîte de nuit means nightclub.
Why is "this box is not bigger than the other one" not accepted. It's saying the same thing?
No, if the boxes were the same size, you could say the sentence you indicated. In other words, one box definitely has to be bigger than the other, but the original sentence is focusing on the smaller box.
this box is not big enough than the other
can we use "comme" here instead of "que" ?
this box is not SO large as the other one. Duolingo is being a bit nit-picky in not allowing SO.
At full speed this is quite hard to understand, the french have a beautiful but fast language