Definition
When a film's image or sound becomes stronger gradually, or is made to do so by someone.
（使）（画面）逐渐显现；（使）（声音）逐渐增强
The background music gradually faded in during the busy opening, making the entire scene more captivating.
背景音乐在繁忙的开场中逐渐淡入，使整个场景更加吸引人。
The director chose to fade in the sound effects during the climax of the film to heighten the audience's sense of urgency.
导演选择在电影高潮时淡入音效，以增强观众的紧迫感。
He faded in the image at the start of the presentation, giving the audience time to adjust.
他在演示开始时淡入影像，让观众有时间适应。