ptychotis oil

例句：

1. 1. The ptychotis oil is a natural resource that hasbeen used for centuries in traditional Chinese medicine.
   桐油是一种自古以来就被用于传统中医的自然资源。
2. 2. The ptychotis oil isknown for its antibacterial properties, making it effective against skin infections.
   桐油因其抗菌特性而闻名，对皮肤感染有效。
3. 3. The ptychotis oilis often used as a preservativein food processing to extend the shelf lifeof products.
   桐油常被用作食品加工中的防腐剂，以延长产品保质期。