As comets go, it is a whopper.就彗星而言，它可是个庞然大物。The earth crosses the tracks of certain comets.地球穿过某些彗星的轨迹线.Most stars probably have their quota of planets, meteorids, comets, and asteroids.多数恒星也许还拥有若干行星 、 流星 、 彗星和小行星....
Most stars probably have their quota of planets, meteorids, comets, and asteroids.多数恒星也许还拥有若干行星 、 流星 、 彗星和小行星.As comets go, it is a whopper.就彗星而言，它可是个庞然大物。...unnamed comets and asteroids.未命名的彗星和小行星The earth crosses the t...