I'm doing some work down at local library.这句话中用的down是什么意思啊?

I'm doing some work down at local library.这句话中用的down是什么意思啊? I'm down,down,down. i'm taking you down to the doctor这句话是什么意思 It is time to get down to do some serious work 这句话哪里错 at down是什么意思 i'm so down Calm the fuck down这句话是什么意思 I'm going down./Going down. 有一首歌,歌词i'm going down,going down down I'm falling down的中文意思 i'm down with that的意思 I`m loser. I want to quiet down.是什么意思?谢谢