The other will replace a citrus farm's coal-fired heating system with one that burns sawdust—a by-product of wood processing usually discarded.
The other will replace a citrus farm's coal-fired heating system with one that burns sawdust—a by-product of wood processing usually discarded.
计画之二则打算将一个柑橘农场的燃煤暖气系统，换成燃烧木屑的系统，而木屑是木材经过处理后通常会丢掉的副产物。