求翻译：正当他们准备将仪器搬出楼时，门卫听到响声，并立即打电话向学校附近的派出所报了警。20分钟后，两个窃贼被抓了。警察告诫大家要防范窃贼。是什么意思？

While they are ready to move out of the instrument building, the guard heard the noise, and immediately called the police station near the school reported to the police. 20 minutes later, two thieves were arrested. Police warned people to guard against thieves.

When they were ready to move out of the building, equipment, and heard a loud sound, immediately made a phone call to the police station near the school, reported it to the police. After 20 minutes, the two thieves who was captured. Police warn you to guard against thieves.

Right they prepare when carries out the building the instrument, the gate guard hears the sound, and telephones immediately to the school nearby local police station reported to the police.After 20 minutes, two thieves are caught.The police warned everybody must guard against the thief.

正在翻译，请等待...

While they are ready to move out of the instrument building, the guard heard the noise, and immediately called the police station near the school reported to the police. 20 minutes later, two thieves were arrested. Police warned people to guard against thieves.