You can add fading effects, where the audio track gradually gets louder or quieter, or you can add special sound effects of all kinds.

您可以添加淡入淡出效果，使音频音轨的声音逐渐变大或变小，您还可以添加所有此类的特殊音效。

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Certainly, credibility involves a balancing act between establishing a noteworthy track record and fading away into the furniture.

当然，可信度涉及到在建立一个引人注意跟踪历史记录和扮演“幕后英雄”的平衡。

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Firefighter emergency beepers, the ones they wear to keep track of each other inside burning buildings, are slowly fading as batteries run out.

CNN: Cruel calculus: The death toll