严肃地

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

她非常肃了自己经历的苦难。

Joseph gravely heard them out but never offered advice.

约瑟夫肃听他们说完但是却没有提出任何建议。

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

尽管他们肃表明了态度，但他们仍乐于接受我们的援助。