Objective To explore the angiographic appearances of the hemodynamic change of spinal dural arteriovenous fistulae (SDAVF).

目的探讨硬脊膜动静脉瘘血液动力学改变的血管造影表现。

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Our perspectives, our appearances, our disposition can constantly change. But our core nature generally does not.

我们的观点、外貌和性情不断变化着，但通常情况下我们的核心本质却始终如一。

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Its main task is to demonstrate that substance persists in all change of appearances.

它的主要目标是论证实体在现象的变化中持存。

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"Appearances can change and it is important that photo-card licences are updated every 10 years to ensure the police and other enforcement agencies have the best possible photograph to help them correctly identify whether a driving licence is being used fraudulently, " she says.

BBC: Driving licence fines threaten two million drivers

But, despite rebellious appearances, the reformers have lost this important round in the struggle for change.

ECONOMIST: They have lost a crucial round in Iran��s struggle for change

However it is still not yet clear whether is he is allowed now to play for Mali under new FIFA regulations, which allow players to change national allegiances but with certain restrictions on age, dual nationality and the level of past international appearances.

BBC: SPORT | Football | African | Mali confident on Kanoute