adv.立即，随即，因此，于是，在其上

Upon hearing the news, she burst into tears.
听到这个消息后，她突然哭了起来。
Thereupon, the judge declared the defendant guilty.
于是，法官宣布被告有罪。
Upon arrival, they were greeted with a warm welcome.
他们一到就受到了热烈的欢迎。
He immediately got up from his seat upon being called.
他一被叫到名字就立刻从座位上站起来。
Upon seeing the sunset, she felt a sense of peace.
看到日落，她感到一种宁静。
Upon completion of the project, they celebrated their hard work.
项目完成后，他们庆祝了他们的辛勤工作。
The concert began thereupon, with the audience eagerly awaiting the star's appearance.
音乐会随之开始，观众们热切期待明星的出场。
Upon realizing her mistake, she apologized profusely.
意识到错误后，她连连道歉。
Upon entering the old house, a musty smell greeted them.
走进那座老房子，一股霉味扑面而来。
Upon request, the waiter brought out a special dessert for the guest.
应客人的要求，侍者端出了一道特别的甜点。