单词：calera
[地名] [美国、墨西哥] 卡莱拉
词型变化：名词复数形式 : caleras
单词：calera 相关文章
Cement is a major component of concrete, the world's most widely used man-made material, an integral part of roads, bridges and buildings. But making cement requires heating limestone and other materials to very high temperatures, a process that rele
发表于:2019-02-08 / 阅读(543) / 评论(0)
VOA标准英语2010年(一月)
VOA标准英语2010年(一月)