爱因斯坦为什么不记声音的速度【双语课程】5 【科学启蒙】

小朋友们 my little friends,我下面向大家介绍 I will introduce you 一个老爷爷 an old gentleman,如果你听说过他 if you have heard of him,请举手回答 please raise your hand。 大家看 please look at this 我手机上的这张照片 the photo on my phone,就是这个白头发的老爷爷 this old genleman with white hair,谁知道他吗 is there someone who knows him? 好 good,白狐同学举手了 White Fox raised her hand,请回答 please answer。 谢谢 …