但以上细胞取材困难，来源少，对于老年人牙周病及牙周组织大面积缺损的病人难以达到理想的效果。
But these cells were less origin and too difficult to obtain, and it could t achieve ideal results in old patients and in that which periodontal tissues was defect seriously.
圬工拱桥具有就地取材、节省钢筋和水泥、构造简单、有利于普及、承载潜力大、费用少等优点，在我国修建的比较多。
With the merits of full use of the materials, saving steel bar and the cement, structure simple, big bearing potential, and costs few, the masonry arch-bridge is widely used in China.
结论超声引导自动活检术是一种取材成功率高、操作简便、并发症少的组织学取材方法。
Conclusion US-guided automatic biopsy was a good sampling method with high sampling successful rate, operating facility, high histological diagnostic accuracy and low ratio of complication.
结论超声引导自动活检术是一种取材成功率高、操作简便、并发症少的组织学取材方法。
Conclusion US-guided automatic biopsy was a good sampling method with high sampling successful rate, operating facility, high histological diagnostic accuracy and low ratio of complication.
应用推荐