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。
To clear your media pool of all un-used clips click on the previously mentioned lighting strike button.
若要禁用自动编码检测， % 请清除此选项。
To disable the auto - detection of encoding, clear this option.
若要将其他背景色设置为项目背景色，需要清除项目背景复选框，然后单击舞台调色板。
To use a background other than the one set in the project preferences, clear the project background check box and click the Stage color palette.
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