恐怕不是。他们的表情都很严肃。

I am afraid not. They look serious.

youdao

他们注意到双方的评论都是书面的，而不是口头的，因此应该被认为是表明了双方严肃的立场。

They noted that both sides' comments were written, not spoken — and therefore should be taken as a serious view of intent.

youdao

至于老师，我希望他们能多些微笑，而不是总挂着一张严肃的脸。

For teachers, I hope they can smile more often rather than wearing a serious face in front of us.

youdao