从一个建模的观点来看，有许多不同种类的关系十分有趣：所有关系，直接的关系，联合，等等。
From a modeling point of view, there are many different kinds of relationships that could be interesting: ownership, directed relationships, associations, and so on.
目的：探讨同种异体骨联合自体骨复合骨移植应用于儿童瘤样骨病术后的最佳治疗措施。
AIM: to approach the best therapeutic measures after allochthonous intermingled with autogenous bone transplantation in children with tumor-like legion.
目的研究罗哌卡因腰麻-硬膜外联合阻滞用于同种异体肾移植手术麻醉的安全性和有效性。
Objective To investigate the safety and effect ion of 0.75% ropivacaine used in combined spinal-epidural block for renal transplation operation.
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