单词：sph
abbr. spherical lens 球面透镜
单词：sph 相关文章
U.S. President Barack Obama travels Friday to Trinidad and Tobago to attend the fifth Summit of the Americas, a gathering of all hemispheric leaders minus Cuba. U.S. officials say the summit is an opportunity to forge a regional response to the glob
发表于:2019-01-13 / 阅读(180) / 评论(0)
VOA标准英语2009年(四月)
VOA标准英语2009年(四月)