单词：siliceous sandstone
硅质砂石,含硅砂石
单词：siliceous sandstone 相关文章
The rock called sandstone is made up of a great many grains of sand. The beating of the rain on this rock washes the grains apart, and so the hard sandstone slowly changes into loose sand. 砂岩主要由大量沙粒组成。当雨水打下来的时候
发表于:2018-12-07 / 阅读(84) / 评论(0)
英国学生科学读本
英国学生科学读本
The Strange and Beautiful World of Arches National Park 犹他州拱门国家公园:奇怪而美丽的世界 This week on our national parks journey, we travel to Utah. The western state is home to several of the most popular national parks in Americ
发表于:2018-12-16 / 阅读(140) / 评论(0)
2016年VOA慢速英语(十)月
2016年VOA慢速英语(十)月
Lesson 50 Only A Stone 第50课 只是一块石头 What is the oldest thing you have seen? One boy thinks it is a church, for he has seen a date on one which tells that it was built hundreds of years ago. 小朋友，你见过的最古老的东西是什
发表于:2019-02-13 / 阅读(94) / 评论(0)
英国学生科学读本
英国学生科学读本