How to pronounce the word "Shang" on both sides of the Yellow River in the poems of the imperial army? Give an explanation

You should read "Chang" In ancient times, there were obvious differences between "clothes" and "clothes". Shuowen said, "People who wear clothes are also naked. Dress up, dress up. " Which is under the coat. The "clothes" in At First I Can't Stop Tears Falling on My Coat is a general term for "clothes" and "clothes", namely "clothes".