Plate movements are the surface expressions of motions in the mantle—the thick shell of rock that lies between Earth's crust and its metallic core.
板块运动是地幔运动的表面现象。地幔是位于地壳和金属内核之间的一层厚厚的岩石壳。
Larger ones, such as BP, Chevron and Shell, are setting up their own digital-rock-physics laboratories.
而大型石油公司—如BP、雪佛龙和壳牌正在创建自己的数字岩石物理实验室。
In one experiment 3-year olds looked at pictures of a fork, teddy bear, truck, and other human-made objects. They also looked at pictures of a leaf, shell, or rock.
在一项实验中，让一些三岁的孩子去看叉子、泰迪熊、卡车和其他一些人造的东西的图片，也让他们看树叶、贝壳和石头的图片。
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