Text-killer is the final text, usually a one word reply, such as "yeah" and "haha ok", used to designate the end of the conversation.
短信终结语就是最后一条短信，通常是一个词的答复语，比如“是啊”或“哈哈好的”，表明对话结束。
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Of course, the game wasn't just a time-killer. It was initially intended as a way to teach people basic mouse controls in an era where most computing was text-based.