介词短语
中文翻译：在开幕式上
同义词：
['at the beginning', 'at the start', 'at the outset']
例句：
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1.The show opens at 7:30 p.m. every Friday.
这个节目每周五晚上7:30开始。
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2.We are at the opening of the new exhibition.
我们正在新展览的开幕仪式上。
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3.The company is at the opening of its new headquarters.
该公司正在其新总部的开幕仪式上。