为以下单词补充最后面的一个字母。
老师写在电脑上，单词就出现在后面的屏幕上。
The teachers write on the computer, and their words appear on the screen behind them.
语助词一个单词代替或提前指代某一后面的词或短语。
A word that stands in place of and anticipates a following word or phrase.
语助词一个单词代替或提前指代某一后面的词或短语。
A word that stands in place of and anticipates a following word or phrase.
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