from which can be seen the strata the drill has been cutting through.
從中能看出鉆頭所鉆透的地層。
新概念英語第四冊
Lesson 13 The search for oil
?? 句中詞匯解析
從本句中提取的重要詞匯
n. 地層;巖層( stratum的名詞復數(shù) );地層;社會階層;
"people from all social strata"
來自不同社會階層的人
近義：stratums
n. 操練;鉆頭;軍事訓練;（應(yīng)對緊急情況的）演習;
vt.& vi. 鉆（孔）;打（眼）;操練;訓練;
vt. 作…演習，操練;
?? 錐哦(諧音）: 練習 鉆孔
"After a long drill, the commander told his men to fall out."
在操練了很長時間以后, 指揮官命令士兵們解散.
近義：instruction, learning, schooling, teaching, training, tuition
cutting
[['k?ti?]]
n. 切斷, 切下, 路塹\\n[化] 切屑
近義：snippet, clipping, snip, trimming, clip, trim
反義：innocuous, offenceless, safe, unoffending, benign, harmless
v. 看見( see的過去分詞 );觀看;領(lǐng)會;考慮;
"The aforementioned person was seen acting suspiciously."
有人看見前面提到的那個人行動可疑。