我有一头乌黑的长发用英文怎么说

"I have long, jet-black hair."
"jet-black"是指黑色深沉的意思，来源于"jet"这个词，是指黑色的玛瑙石，因为这种石头颜色深沉，所以有了这个词汇。

例句:

She had jet-black hair that flowed down her back.
她有一头乌黑的长发，长发垂落在她的背上。
He was drawn to her jet-black hair and dark eyes.
他被她乌黑的长发和深邃的眼睛吸引。