Learning material is still the 10-20 minute video clip.
学习材料仍然是这10 - 20分钟的影视片段。
Pure silver is the very best performing material for audio, video or digital.
纯净银是最佳的传输材料，无论是声音、影像或数位资料。
Video teaching material is a very important study media.
录像教材是远程学习中非常重要的学习媒体。
Video teaching material is a very important study media.
录像教材是远程学习中非常重要的学习媒体。
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