declare the commencement ; declare the opening ; announce the commencement ; announce the opening
宣布开/闭幕 declare...open/closed
听到运动会宣布开幕，我们学校的所有同学都欢呼起来。
Hearing the sports meeting declared open, all the students in our school burst into cheers.
youdao
他们隆重地剪彩，宣布展会开幕。
They ceremoniously cut a piece of ribbon, declaring the exhibition open.
《柯林斯英汉双解大词典》
明天市长将在市政厅宣布大会开幕。
The Mayor will open the proceedings at the City Hall tomorrow.
《牛津词典》
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