通过一个视频分享的功能，你可以同其它人一起观看视频，尽管你们在这个视频之外的交流非常有限。
There's a video-sharing ability, by which you can watch videos "with" other people, though your interactions are limited to a chatroom beside the video.
他只能通过一个发声合成器同别人交流。这个计算机式的发声合成器固定在他那装有马达的轮椅上；他吃力地操作键盘，把要说的话一个词一个词地打出来。
He can communicate only through a voice synthesizer, which he operates by laboriously tapping out words on the computer attached to his motorized chair.
通过检查这个文件并和用户交流，情况比较清楚了。
By reviewing it and interviewing the user, it becomes clear that.
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