Senior Brother, why is it so cold here? Next sentence

Answer: Senior brother, why is the weather so cold? The next sentence should be 'Let's go pick up some dry firewood and make a fire to keep warm', because as mentioned before, it must be in the house if the weather is cold. That's why people say it's so cold outside, so the next sentence naturally talks about going together to collect some firewood to make a fire to keep warm.