The geologist needs to know what rocks the drill has reached,
地质学家需要知道钻头已经到达什么样的岩层，
新概念英语第四册 Lesson 13 The search for oil

📚 句中词汇解析

从本句中提取的重要词汇

know [no] 词频1 词根: 知道
v. 知道;了解;认识;确信; n. 知情;
💡 知道know的人爱说自己不no知道
"Do you know your ABC?"
你认识所有的字母吗？
近义：learn, understand, get, cognize, comprehend, meet
drill [drɪl] 词频2 词根: dr-
n. 操练;钻头;军事训练;（应对紧急情况的）演习; vt.& vi. 钻（孔）;打（眼）;操练;训练; vt. 作…演习，操练;
💡 锥哦(谐音）: 练习 钻孔
"After a long drill, the commander told his men to fall out."
在操练了很长时间以后, 指挥官命令士兵们解散.
近义：instruction, learning, schooling, teaching, training, tuition
geologist [dʒi'ɔlədʒist]
n. 地质学家，地质学者;
"The geologist found many uncovered fossils in the valley."
在那山谷里,地质学家发现了许多裸露的化石.
needs
adv. （只与must连用）必须地
rocks
n. 岩石, 岩礁；岩石礁石（rock复数形式）

📚 更多「新概念英语第四册」例句

and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role.
我们只要看一看蝙蝠回声定位这一极不寻常的发现，就可以探究一下声音在什么情况下有绝对的实用价值。
Some old people are oppressed by the fear of death.
有些老年人因为怕死而感到烦恼。
It is said that the nerve poison is the more primitive of the two, that the blood poison is, so to speak, a newer product from an improved formula.
据说，神经毒液在两种毒液中是较为原始的一种，而溶血性毒液，打个比方说，是根据改良配方生产的一种较新的产品。
They had laboured for three years to produce this floating work of art;
瑞典人辛辛苦苦干了3年才建成这件水上艺术品，
who rolled balls down inclined planes,
他就是那个使球体沿斜面向下滚动，
An old watch, by contrast,
然而一只老掉牙的手表，