单词：Pocono sandstone
[岩] 波科诺砂岩
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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(59) / 评论(0)
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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(117) / 评论(0)
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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(68) / 评论(0)
英国学生科学读本
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