1747, possibly a specialized use of Middle English schale "shell, husk, pod" (late 14c.), also "fish scale," from Old English scealu (see shell (n.)) in its base sense of "thing that divides or separate," in reference to the way the rock breaks apart in layers. Compare Middle English sheel "to shell, to take off the outer husk" (late 15c.). Geological use also possibly influenced by German Schalstein "laminated limestone," and Schalgebirge "layer of stone in stratified rock."
雙語例句
1. We must find economical methods for extracting oil from shale.
我們必須找到從頁巖中采油的經(jīng)濟(jì)方法.
來自《現(xiàn)代漢英綜合大詞典》
2. We can extract oil from shale.
我們可以從頁巖中提取石油.
來自《簡明英漢詞典》
3. More ammonium sulphate solution is being recovered in the process of distilling oil shale.
在提煉油頁巖的過程中回收的硫酸銨液比過去多了.
來自《簡明英漢詞典》
4. The limestone, sandstone and shale of this area were soft.
這個地區(qū)的灰?guī)r 、 砂巖和頁巖都是很柔軟的.
來自辭典例句
5. Thin layers of sandy shale, and carbonaceous fragments are locally present.