umbrult

例句：

1. 1. The umbralt is a rare and valuable gemstone.
   乌木是稀有且珍贵的宝石。
2. 2. The umbralt has been used in ancient civilizations for its healing properties.
   乌木在古代文明中被用于其治疗属性。
3. 3. The umbralt is said to have the power to bring good luck and protection.
   据说乌木具有带来好运和保护的力量。