会谈的主题提前一周宣布。
演讲的主题已经提前一个星期宣布了，但主讲人的名字却没有宣布。
The topic of the speech is announced a week in advance, but the name of the speaker is not.
学生通常需要提前为研讨会和辅导课准备工作，这可以采取研究讨论主题、写论文或解决问题的形式。
Students are normally expected to prepare work in advance for seminars and tutorials and this can take the form of researching a topic for discussion, by writing essays or by solving problems.
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