The hinge of sketch drawing depends on correct shape structure and form relations and on the understanding and grasp of the overall composition.
素描创作的关键在于正确把握形体结构和构成关系，对整体造型进行深刻地感受和认识。
The relations among composition, casting methods, room-temperature properties and elevated temperature properties of magnesium alloys are summarized systematically.
系统地总结了各类铸造镁合金的成分、铸造方式与其高、低温力学性能之间的关系。
The features of thermoluminescence of quartz in gold ore are described, and its relations to gold mineralization and composition of quartz are analyzed.
本文描述了赣中地区若干金矿床石英热发光特征，分析了其与金含量及化学成分之间的关系。
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