皂皮树

例句：

1. 1. The soap tree is a symbol of purity and cleanliness.
   皂荚树是纯洁和清洁的象征。
2. 2. The soap tree produces natural soaps that are safe for use on human skin.
   皂荚树生产天然的肥皂，对人体皮肤安全。
3. 3. The soap tree is an important source of income for many rural communities.
   皂荚树是许多农村社区的重要收入来源。