"Hair" is the Engpsh word for "头发". The origin of the word "hair" comes from Old Engpsh "hǣr", which has Germanic roots.
Example sentences in Engpsh with Chinese translations:
She has long, curly hair. (她有一头长长的卷曲的头发。)
He cuts his hair every month. (他每个月都理发。)
I dye my hair blonde. (我染了金色的头发。)
The wind was blowing her hair in all directions. (风吹得她的头发四散飘扬。)
He was losing his hair. (他开始掉头发了。)