After4-5 minutes use the floor-cleaning machine to clean completely and remove the old wax.
5分钟后用洗地机完全的清洁地面并去除旧蜡。
2
Floor-cleaning machines capable of responding to their environment were among the first commercially available domestic products worthy of being called robots.
能够对所处环境作出反应的地面清洁机，是第一批被商业化的，称得上机器人的家用产品之一。
3
On November 12, while two men were busy cleaning windows, a rope of the platform broke near the 68th floor.