What makes a shadow?, Wind, Light, Water, When do we see the longest shadows?, At midday, At night, In the morning and evening, Why is the shadow short?, The Sun is high in the sky, The Sun is small, The object is moving, If the Sun moves, what happens to the shadow?, It disappears forever, It changes position and length, It becomes brighter

视觉风格

活动设置

排行榜

切换模板

恢复自动保存:?