| Expression | 他们钻透了几层岩石以寻找石油. |
|---|---|
| Meaning | They drilled through several layers of rock to reach the oil. |
| Reading | tā men zuàn tòu le jǐ céng yán shí yǐ xún zhǎo shí yóu. |
Tags: hsk2-limited3-part2
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