天文学家通过亮度变化推测,那颗恒星周围可能存在一颗行星。Tiānwénxuéjiā tōngguò liàngdù biànhuà tuīcè, nà kē héngxīng zhōuwéi kěnéng cúnzài yì kē xíngxīng.Astronomers inferred from changes in brightness that a planet may exist around that star.
地球是太阳系里唯一适合人类居住的行星。Dìqiú shì tàiyángxì lǐ wéiyī shìhé rénlèi jūzhù de xíngxīng.Earth is the only planet in the solar system suitable for human life.
科学家发现了一颗绕着遥远恒星转的巨大行星。Kēxuéjiā fāxiànle yì kē ràozhe yáoyuǎn héngxīng zhuàn de jùdà xíngxīng.Scientists discovered a giant planet orbiting a distant star.