1. The zamboni cleaned the ice rink before the game started.
冰平机在比赛开始前清洁了溜冰场地。

2. The zamboni operator carefully maneuvered the machine to smooth out the rough spots on the ice.
冰雪清理车的操作员小心翼翼地操纵机器，使冰面上的凹凸点变得平滑。