練習(xí)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.
朗讀時間：55s/54s
任務(wù)配置： L0+L4
知識筆記：
單詞：mineral 礦物的 / boring 鉆孔 / derrick 井架 / block and tackle 滑輪組 / haul 拖 拉 / rotate 使轉(zhuǎn)動 /?
練習(xí)感悟：
讀的有些倉促 沒有查音標(biāo) 都是后補的 開開心心的
