Once inside the virtual classroom, they have access to a chat feature, an interactive white board and a video window where they can see and hear the tutor in live video and audio.

一旦进入虚拟课程，他们就可以进入聊天框，一个有互动功能的白板还有一个视频窗口，通过这个视频窗口他们可以看到教师的现场授课。

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There are various different learning tools available for each subject, including board games, audio cassettes and CDs, and activity cards.

该网站的每一个主题都包含了形形色色的学习工具，包括棋盘游戏，录音带和光盘，以及活动卡。

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The model's analog audio circuit board is isolated from the video board to avoid interference.

该模型的模拟音频电路板是分离的视频板，以避免干扰。

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