soap-bark tree

例句：

1. 1.The soap-bark tree is a symbol of the natural world.
   肥皂树是自然世界的象征。
2. 2.The soap-bark tree has been used for centuries to make soap.
   肥皂树被用来制作肥皂，这种传统已经流传了几个世纪。
3. 3. The soap-bark tree is also known for its medicinal properties.
   肥皂树还以其药用性质而闻名。