严肃地

She spoke with great seriousness of the hardships she had endured.

她非常肃地讲述了自己经历的苦难。

Joseph gravely heard them out but never offered advice.

约瑟夫肃地听他是却没有提出任何建议。

Despite their protestation, they were glad to accept our help.

尽管他肃地表明了态度，他仍乐于接的援助。