pine bark oil

例句：

1. 1. The pine tree's bark oil is a natural insect repellent.
   松树的皮油是一种天然的驱虫剂。
2. 2. The pine tree's bark oil is used in the production of candles.
   松树的皮油用于生产蜡烛。
3. 3. The pine tree's bark oil has been found to have anti-inflammatory properties.
   松树的皮油被发现具有抗炎性质。