"妈妈有一头长发" 用英语表达为 "My mother has long hair."
"long hair" 是英语中对长发的一般表达方式，它来源于"long"和"hair"两个词的组合。"long" 意为"长的"，"hair" 意为"头发"。
例句：
She has beautiful long hair. (她有一头漂亮的长发)
He grew his hair long for the role. (他为了这个角色留长了头发)
Can you please braid my long hair? (你能给我编个辫子吗？)