fir needle oil

例句：

1. 1. This type of oil is commonly used in the production of wood-based products.
   这种油在生产木制品中常用。
2. 2. The scent of this oil is known to have a calming effect on people.
   这种油的香味被认为对人有镇静作用。
3. 3. In winter, it's common to use fir needle oil as a heating source.
   冬天，人们常使用针叶油作为取暖来源。