sound - caused by vibrations that travel through the air, light - a form of energy that moves in straight lines, heat - energy that can be measured with a thermometer, example of sound - car horn, example of heat - oven, example of light - flashlight, eyes - we see light with our, ears - we hear sound with our,

energy

打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？