1. announce vt. 宣布; 述说; 声称
例句：Please announce to the children that there will be no school this afternoon.
请通知孩子们今天下午不上课。

2. appearance n.外貌，外观; 出现
例句：He was vain about his appearance.
他对自己的外貌颇为得意。

3. celebrate vt.庆祝; 祝贺; 举行宗教庆
例句：How did you celebrate May Day this year?
你们今年是怎样庆祝五一节的？

4. anniversary n.周年纪念日
例句：A golden wedding is the fiftieth anniversary of a marriage.
金婚是结婚五十周年纪念日。
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