这种较自由的方式把新信息替换到练习对话中。
In this slightly freer way students substitute new information into the practice dialogues.
然后他们再练习这些会话，但是以较自由的方式把新信息替换到练习对话中。
They then practice the conversations again, but in a slightly freer way by substituting new information into the practice dialogues.
类型的信息替换Submit按钮，这样用户在等候响应期间就不会反复单击按钮了。
"Type message so that users do not repeatedly click on buttons while waiting for a response."
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