练习材料：
[Day 1734 2019-06-25]
Lesson 13-1 The search for oil
The deepest holes of all are made for oil, and they go down to as much as 25,000feet. But we do not need to send men down to get the oil out, as we must with other mineral deposits. The holes are only borings, less than a foot in diameter. My particular experience is largely in oil, and the search for oil has done more to improve deep drilling than any other mining activity. When it has been decided where we are going to drill, we put up at the surface an oil derrick. It has to be tall because it is like a giant block and tackle, and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.
卖萌的ScalersTalk第四轮新概念朗读持续力训练Day227 20190625
朗读时间：55s/54s
任务配置： L0+L4
知识笔记：
单词：mineral 矿物的 / boring 钻孔 / derrick 井架 / block and tackle 滑轮组 / haul 拖 拉 / rotate 使转动 /
练习感悟：
读的有些仓促 没有查音标 都是后补的 开开心心的
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