| 单词 | core-drilling |
| 释义 | > as lemmascore-drilling core-drilling n. a method of drilling in which an annular hole is made in the ground and a core extracted; core-sampling. ΘΚΠ society > occupation and work > industry > mining > [noun] > drilling for samples core-drilling1903 core-sampling1927 1903 Sci. Amer. 18 July 44/1 Core drilling is indispensable in a great variety of engineering and mining enterprises, affording, as it does, a means for drilling out a sample core or column of rock. 1955 Oxf. Junior Encycl. VIII. 342/1 Further exploration is usually necessary in order to assess the commercial value of the deposit. This information may be obtained by core-drilling. < as lemmas |
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