单词:cored for lightness
[建] 为减轻重量而钻空
单词:cored for lightness 相关文章
Black and White黑与白 Sometimes you hear it said that white is a combination of all the colors of the rainbow -- and that black is the absence of color. Find out more about whether black and white are colors -- today on Earth and Sky. JB: This is Ear
发表于:2018-12-07 / 阅读(55) / 评论(0)
(科普英语)Earth and Sky