The opening ceremony would be grand.



（奥运会）开幕式场面将十分壮阔。

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一般开幕式的英文表达，opening ceremony，有时也简单地说成opening。
例：
The mayor made a speech at the opening.
市长在开幕式上发表了演说。
The ceremonial opening of Parliament was a fine spectacle.
该议会的开幕式场面隆重。