请用以下单词说明潜望镜的工作原理 :light ,source,mirror,light travels,reflect
请用以下单词说明潜望镜的工作原理 :light ,source,mirror,light travels,reflect
light travels 是什么意思?光年的英语单词是什么?
Light travels at about____.
light travels是什么意思?
light travels much faster than s_____ 补充单词
说明理由1.The fastest thing in space is light.Light travels ____
潜望镜的工作原理是什么?
light travels faster than sound的同意句
画图解释潜望镜的工作原理
It ( )that light travels faster than sound
Light travels move quickly than sound?
Light travels faster than sound改为过去式