wood tar

例句：

1. 1. The wood tar is used to waterproof the walls.
   木焦油用于防水墙。
2. 2. The old house has a lot of wood tar in its walls.
   这所旧房子的墙壁上有很多木焦油。
3. 3. The wood tar was extracted from the trees that were felled in the forest.
   木焦油是从森林中砍伐的树木中提取出来的。