然而，关于这种湍流变动的内在物理机制的理解还不够深入。

However, the underlying physical mechanisms responsible for the turbulence modification are not well understood.

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假设他们在踢球之前和你交流变动的事情，并假设守门员一直清晰地被辨认，那么这在法律上是允许的。

Providing they communicate the changes to you before making them, and providing that the goalkeeper is clearly identified at all times, then this is allowed in law.

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湍流气粒两相流中主要有两个问题：颗粒的扩散与湍流变动。

There are two main problems in the gas-particles two-phase turbulence flows: particles dispersion and turbulence modulation.

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