av presentation
av演讲
以上为机器翻译结果，长、整句建议使用 人工翻译 。
For the first two, you may have no choice but to go with an av free presentation, so have a printed copy of your notes with you.
对于前两种情况，你只能用简易型音频或视频无线器来演示文稿，这时你需要一份打印稿。
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