The spheres had been magnetized and attracted or repelled each other all the time. In the centre of the hall, there were a number of tall structures which contained coloured lights. These lights flickered continuously like traffic lights which have gone mad.

　　13. The spheres had been magnetized and attracted or repelled each other all the time.

　　金属球经过磁化，互相之间不停地相互吸引或相互排斥。

　　语言点:句子结构分析:had been magnetized 是过去完成时的被动语态。all the time强调“一直不停地”。

　　14. In the centre of the hall, there were a number of tall structures which contained coloured lights.

　　展厅中央是装有彩色灯泡的许多高高的构件。

　　语言点:句子结构分析:in the centre of the hall置于句首，作地点状语。Which引导定语从句，修饰structrues。

　　15. These lights flickered continuously like traffic lights which have gone mad.

　　灯泡一刻不停地闪烁着，就像失去了控制的红绿灯。

　　语言点:句子结构分析:which引导定语从句，修饰traffic lights。