Some of us learn best from books, but many people find it easiest to engage with a combination of audio and visualmaterial.
我们可以从书中学到更多，但是我们会发现融入这种有声的世界，栩栩如生的画面不是更容易吗？
2
presentation of documentary evidence, material evidence and audio-visualmaterial;
出示书证、物证和视听资料；
3
Addition to the introduction and conclusion, is divided into four chapters, the specific structure is as follows: Forward: to introduce the audio-visualmaterial of significance and characteristics.