So with apologies for being a bit more boring for twenty minutes, let's do something we'll call formal stuff.

抱歉接下来的二十多钟分可能有点枯燥,我们来做点正经事

耶鲁公开课 - 博弈论课程节选

His father said, "I see you are spending more of your time in idleness than in taking care of business at this crucial time."

他的父亲对他说,"我老是发现,你成天游手好闲,而不在这节骨眼儿上多花点功夫做正经事"

耶鲁公开课 - 欧洲文明课程节选