Chemicals in the factory's sewage system have changed the ecology of the whole area.
Chemicals in the factory's sewage system have changed the ecology of the whole area.
这座工厂排出的化学物质改变了整个地区的生态.
Chemicals in the factory's sewage system have changed the ecology of the whole area.
这座工厂排出的化学物质改变了整个地区的生态.