单词：Buntsandstein(buntsandstone)
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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
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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
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克雷格-布汀(Craig Buntin)是加拿大著名双人滑选手，曾多次参加国际比赛并获奖。退役后，他通过自己的努力创办公司并取得了MBA学位。他讲述了自己如何一次又一次达到事业的高峰。
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