英语听力：自然百科 国家地理：钻石：黑暗的一面—7

 It was becoming clear how the brave and expert thieves pulled off the world's biggest gem¹ robbery. From a flight of stairs in the diamond center car park, they used a stolen key to open the door leading to the vault², and there they somehow managed to defeat the battery of the security equipment. They were expert thieves.

-In the safe room, you have light detection, motion detection, heat detectors³, and a enormous safe door with a code and an alarm system on it.

 

It turned out that everyone of these devices could be easily undermined. The light level sensor⁴ was covered with a black tape. The video cameras inside and outside of the vault door were shrouded⁵ with plastic bags. The motion sensor was covered with thick spray. Eliminating one security device after another, they got to the vault door. On the other side laid enough diamonds to fill a small swimming pool.

-It's an enormous safe door with an alarm system with magnets on it. You need a code and a key to open it.

The main alarm system was linked to magnetic contact on either side of the vault door. If opened, the magnets separated, triggering the alarm. The thieves founded an ingenious simple way round it. Before opening the vault, they removed both contacts, keeping them together, so the circuit wasn't broken, even when the door was opened. But then they had to defeat the lock with around a million of possible combinations. But no signs that the locks have been attempted* with. Detectors were at lost to see how the thieves could open it.

 

1 gem   

n.宝石，珠宝；受爱戴的人 [同]jewel

参考例句：

• The gem is beyond my pocket.这颗宝石我可买不起。
• The little gem is worth two thousand dollars.这块小宝石价值两千美元。

2 vault   

n.拱形圆顶，地窖，地下室

参考例句：

• The vault of this cathedral is very high.这座天主教堂的拱顶非常高。
• The old patrician was buried in the family vault.这位老贵族埋在家族的墓地里。

3 detectors   

探测器( detector的名词复数 )

参考例句：

• The report advocated that all buildings be fitted with smoke detectors. 报告主张所有的建筑物都应安装烟火探测器。
• This is heady wine for experimenters using these neutrino detectors. 对于使用中微子探测器的实验工作者，这是令人兴奋的美酒。 来自英汉非文学 - 科技

4 sensor   

n.传感器，探测设备，感觉器（官）

参考例句：

• The temperature sensor is enclosed in a protective well.温度传感器密封在保护套管中。
• He plugged the sensor into a outlet.他把传感器插进电源插座。

5 shrouded   

v.隐瞒( shroud的过去式和过去分词 )；保密

参考例句：

• The hills were shrouded in mist . 这些小山被笼罩在薄雾之中。
• The towers were shrouded in mist. 城楼被蒙上薄雾。 来自《简明英汉词典》