气氛很严肃用英文怎么说

在英语中，可以用 "serious" 来形容气氛很严肃。这个词的来源可以追溯到拉丁语 "sērius"，意思是 "重要的"、"认真的"。

下面是一些用 "serious" 形容气氛很严肃的例句，并提供了中文翻译：

The atmosphere at the meeting was very serious. (会议的气氛非常严肃。)
He had a serious expression on his face. (他的脸上有一副严肃的表情。)
The situation is very serious and requires immediate attention. (情况非常严肃，需要立即注意。)
She always takes her work very seriously. (她总是非常认真地对待自己的工作。)