solemnly
adv. 庄严地；严肃地
例句
The choir walked solemnly past.
合唱队严肃地走了过去。
《牛津词典》
He nodded solemnly.
他郑重地点了点头。
She solemnly promised not to say a word to anyone about it.
她郑重承诺不向任何人透露一个字。
