怎么把视频静音

<p>Lucas and Mathias, 8-year-old sons of lumberjacks in the Vosges forest, are the best of friends. One day, while driving his car, Lucas&#39; father fatally collides with Mathias, who is cycling down the mountain. Sitting in the back of the car, Lucas watches helplessly as his father throws his friend&#39;s lifeless body into the ravine. One look is all it takes for him to realize that h...</p>