kolophonium

例句：

1. 1. The school choir performed at the annual music festival.
   学校合唱团在年度音乐节上表演。
2. 2. She joined the choir to improve her singing skills.
   她加入合唱团是为了提高她的歌唱技巧。
3. 3. The choir sang a beautiful rendition of "Sweet Child O' Mine" during the concert.
   合唱团在音乐会上演唱了《甜蜜的孩子》这首美妙的旋律。