| 例句 |
Dark clouds moved quickly across the sky.乌云在天空快速移动。The rapid movement of an object close to the eye triggers an automatic reflex.物体在眼前快速移动时，眼睛就会自动作出反应。That unidentified flying object just hurtled across the sky. We cannot make out what it was.那个不明飞行物体在空中快速移动，我们看不清它是什么。 |