伴着汽车数量的增加，停车难成为城市中急待解决的问题。

As the quantity increase of the car, parking problems in cities become urgent problems to be solved.

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因此，获得良好的种植体软组织界面是一个急待解决的问题。

So how to obtain a good interface between implant and soft tissue is essential to solve as soon as possible.

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韧性断裂计算力学研究中急待解决的问题及其研究的广阔领域。

The problems on flexibility fracture calculation mechanics, and its wide research field are also discussed.

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