planet词性 词义
planet n. 行星；地球(尤指环境) 1. The orientation of the planet's orbit is changing continuously. 该行星轨道的方向不断变化。 2. Scientists are studying photographs of the planet for signs of life. 科学家仔细察看行星照片，寻找生命迹象。 3. The planet Jupiter may have no solid surface...