以下为句子列表：
英文: The advantages of dual grafts for bridging defects are as follows: (1) mechanical fixation is better than fixation by a single onlay bone graft; (2) the two grafts add strength and stability; (3) the grafts form a trough into which cancellous bone may be
中文: 双侧植骨桥接骨缺损的优点包括：①机械固定作用比单侧贴附植骨更好；②双侧植骨可增加强度和稳定性；③双侧的植骨可形成一骨槽，可在其中压紧松质骨；④与单侧植骨不同，双侧植骨在愈合过程中可防止挛缩的纤维组织危害移植的松质骨。
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