1. One of the fainter objects in Messier's catalog, the Owl Nebula is a planetary nebula, the glowing gaseous envelope shed by a dying sun-like star as it runs out of nuclear fuel. 该星云是梅西耶星表中较暗的一类。猫头鹰星云属于行星状星云，外层是被内部类日死亡恒星进行完核聚变后抛出的气壳。
2. One of the fainter objects in Messier's catalog, the Owl Nebula is a planetary nebula, the glowing gaseous envelope shed by a dying sun-like star as it runs out of nuclear fuel. 在梅西尔的目录中，猫头鹰星云是一个暗淡的行星状星云，发光气体罩遮盖着一个正在死亡的类太阳恒星，其已耗尽了内部核燃料。
3. One of the fainter objects in Messier's catalog, the Owl Nebula is a planetary nebula, the glowing gaseous envelope shed by a dying sun-like star as it runs out of nuclear fuel. 作为梅西耶编录表内较为昏暗的天体之一，猫头鹰星云是一个行星状星云，其炽热的气体外壳由一颗濒临死亡的恒星耗尽核燃料之后吹出。
4. The planetary high doesn't last. The closer the story comes to a lumbering parable of colonialist aggression in the jungles of an extragalactic Vietnam, the more the enchantment fizzles. 波澜壮阔的宇宙场景并没有让观众陶醉很长时间，随着故事情节的深入，你越来越觉得这是发生在银河系外的一场越南战争，沉重的寓意让起初的激动心情逐渐消退。
5. This Paper has Studied the observational parameters of 20 extragalactic H2O megamaser Sources. 研究了至今为止已发现的20个河外H2O超脉泽源的观测参数。
