If we faced a countdown to destruction, could we build a spacecraft to take us to new and habitable worlds? Can we Evacuate Earth? NGC's two-hour special examines this terrifying but scientifically plausible scenario by exploring how we could unite to ensure the survival of the human race.伐木(mù )场作用在伐木工身上，而畜牧场则是作用在圈(🔈)养(yǎng )的动物身(shēn )上。