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."
实用例句
1. We must find economical methods for extracting oil from shale.
我们必须找到从页岩中采油的经济方法.
来自《现代汉英综合大词典》
2. We can extract oil from shale.
我们可以从页岩中提取石油.
来自《简明英汉词典》
3. More ammonium sulphate solution is being recovered in the process of distilling oil shale.
在提炼油页岩的过程中回收的硫酸铵液比过去多了.
来自《简明英汉词典》
4. The limestone, sandstone and shale of this area were soft.
这个地区的灰岩 、 砂岩和页岩都是很柔软的.
来自辞典例句
5. Thin layers of sandy shale, and carbonaceous fragments are locally present.