To clear your media pool of all un-used clips click on the previously mentioned lighting strike button.

若要清除媒体池中所有未被使用到的媒体文件，只需点击前文提到过的“闪电”按钮即可。

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All the practice shows, the measures can protect the architecture and equipment of the cement plant from damage of lighting strike.

实践证明，这些措施可有效保护水泥厂的建筑结构和设备遭受雷击破坏。

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