这位歌手的精彩表演成为了整场演唱会的最大亮点，观众们起立鼓掌久久不停。

The singer's amazing performance was the ___showstopper of the concert, with the audience giving a standing ovation.

技术故障成为了会议的致命问题，导致整个活动暂停了两个小时。

The technical glitch turned out to be a ___showstopper for the conference, bringing the entire event to a halt for two hours.