元素地球化学特征还表明，黑岱沟煤及煤层夹矸中微量元素来源于上地壳。
Which also shows that the trace elements in Heidaigou coal and its dirt are from the upper crust.
基于对纯诗的理解，梁宗岱从中外诗学中咀华掇英，阐释了象征的内涵、象征的特征、象征的审美感受。
Based on the understanding of pure poetry, Liang absorbed the essence from Chinese and foreign verses, and expounded on the symbolic connotations, features and aesthetic feeling.
山东龙山文化是黄河下游海岱地区一支重要的考古学文化，在海岱地区社会文明化进程中起着承前启后的作用。
Shandong Longshan Culture is an important archaeological culture in Haidai region of the lower reach of Yellow River, which had played the role in the process of social civilization in Haidai region.
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