練習(xí)材料：
[Day 1735 2019-06-26]
Lesson 13-2? The search for oil
The geologist needs to know what rocks the drill has reached, so every so often a sample is obtained with a coring bit. It cuts a clean cylinder of rock, from which can be seen the strata the drill has been cutting through. Once we get down to the oil, it usually flows to the surface because great pressure, either from gas or water, is pushing it. This pressure must be under control, and we control it by means of the mud which we circulate down the drill pipe. We endeavour to avoid the old, romantic idea of a gusher, which wastes oil and gas. We want it to stay down the hole until we can lead it off in a controlled manner.
朗讀時(shí)間：46s/45s
任務(wù)配置： L0+L4
知識(shí)筆記：
cutting bit 鉆頭 /
練習(xí)感悟：
有點(diǎn)繞嘴 讀的太少很倉(cāng)促 之前都是邊遛狗邊聽邊跟讀 這樣能讀好幾遍 現(xiàn)在天氣熱了 干啥都沒心情 熱熱熱
