把这篇文章翻译成英文。
以下是一则中国民间传说。在古代，有一个叫做“许仙”的年轻人，他父亲早逝，母亲常常生病。为了治病，他四处求医，最终拜在一个名为“白蛇”的仙女门下学艺。在此期间，许仙意外地爱上了仙女，但是仙女爱上他的感觉也是真的。仙子为了让许仙母亲康复，用了很多仙术，但是没有治好她。后来，白蛇女和许仙共度幸福生活，但是许仙的朋友告诉他这是一位蛇妖，于是他和道士协力制服了白蛇女。但是，在白蛇女被抓回去之前，她曾在许仙面前假扮成他的母亲。这一举动打动了许仙，也使得他对白蛇女产生了新的理解。在一些版本的传说中，由于许仙的背叛，白蛇女伤心而去，但在另一些版本的传说中，白蛇女最终得到救赎，与许仙重聚，并最终成为了一个真正的人。
Here is a Chinese folk tale. In ancient times, there was a young man named Xu Xian. His father died early and his mother was often sick. To cure her illness, he went to seek medical treatment and eventually became a student of a fairy named "White Snake". During this period, Xu Xian unexpectedly fell in love with the fairy, but the fairy's love for him was also genuine. In order to cure Xu Xian's mother, the fairy used many magical powers, but failed. Later, the White Snake fairy and Xu Xian lived a happy life together, but Xu Xian's friend told him that she was a snake demon, so he and a Taoist worked together to subdue the White Snake fairy. However, before the White Snake fairy was taken away, she once disguised herself as Xu Xian's mother in front of him. This move touched Xu Xian and made him have a new understanding of the White Snake fairy. In some versions of the legend, due to Xu Xian's betrayal, the White Snake fairy left in sadness. But in other versions of the legend, the White Snake fairy was eventually redeemed, reunited with Xu Xian, and ultimately became a true human being.