The current primitive materials about Zheng's voyage were not complete, but we are not short of historical materials. The basic facts of Zheng's navigation are clear.
现存关于郑和航海的原始资料虽然不是很完整，但有关的史料还是不少，郑和航海的基本史实是清楚的。
A family of symmetric primitive matrix with small exponent is characterized, consequently a foundation is laid for the complete characterization of symmetric primitive matrix problem.
讨论了一类小指数对称本原矩阵的刻画问题，为对称本原矩阵的完全刻画奠定基础。
Along with the primitive plumage, the 99-million-year-old amber also preserved soft tissue and eight complete vertebrae.
除了原始羽毛，这块9900万年前的琥珀还将软组织和8节完整的椎骨保存了下来。
Along with the primitive plumage, the 99-million-year-old amber also preserved soft tissue and eight complete vertebrae.
除了原始羽毛，这块9900万年前的琥珀还将软组织和8节完整的椎骨保存了下来。
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