You can add fading effects, where the audiotrack 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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If the filmmakers anticipated a dubbed version, they might have delivered the voices on one audiotrack and everything else on another making your job much easier.
You can make changes to affect the listener's mood, add a comic or dramatic effect to the sound, or just simply adjust the audiotrack until it has just the sound you want.