求翻译：2点50，我们的校庆即将开始，我们班先入场就座，等到其他班都进场之后，校庆正式开始主持人宣布正式开始后，前排的几个老师拿起手中的礼花，放了出来，我们同学也把手中的气球放到了天空，那场面，真是太壮观了。国歌响罢，全体坐下，校庆致词便开始了。这个没有什么好看的，只不过是几个干部和退休老教师们上台讲了几句话便结束了。是什么意思？

2:50, our celebration is about to start our first class took their places, to wait until after the other classes approach, the celebration officially began the host announced the official start, the front of a few teachers to pick up in the hands of fireworks, put out our students the hands of the b

2.50 the centennial celebration, we are about to start, we were first seated, wait until the other admission course comes into play, after founding moderator began officially begins, and the front of the pick up several teachers in the hands of the fireworks display, and placed out of the House, we