•Upon her head she wore a black velvet hat.她头戴一顶黑色天鹅绒帽子。

•You can never place enough emphasis upon the importance of safety.无论怎样强调安全的重要性都不过分。

•Upon your arrival (= As soon as you arrive) , please report to the reception desk.到达后请即刻到接待处报到。

•Another couple of weeks and the holidays will be upon us.再过几周，我们的假期就要开始了。