聽力原文:

Detecting explosives
爆炸物檢測
The litmus test
石蕊測試
A new way to spot home-made bombs
一種檢測自制炸彈的新辦法
ALTHOUGH surveillance has increased around the world following March 22nd’s bombings in Brussels, it remains extremely difficult to detect explosives carried into railway stations, shopping malls and other public places. The bombs used in Belgium might well have been picked up after the check-in desks at Zaventem Airport, but the suicide-attackers probably never intended to reach the security gate. The intensive screening carried out inside airports is not practical in many other places. That could change as new techniques are developed.

重點詞匯：

1 litmus 石蕊;
2 spot 看見；看出；注意到；發(fā)現(xiàn)
3 screening 篩查

聽力原文:

The bombs in Brussels were composed of triacetone triperoxide, known as TATP. This is the same explosive used to kill 52 people in London in train and bus attacks in 2005. It is extremely unstable, but for terrorists bent on sacrificing themselves TATP has considerable appeal since it can be made from compounds found in easily obtained materials such as paint thinners and hair-bleaching agents.

重點詞匯：

1 triacetone 丙硫酮;
2 triperoxide 丙酮
3 TATP 三過氧化三丙酮
4 thinner 涂料、清漆等的）稀料，稀釋劑
5 hair-bleaching agents 漂白劑
6 agents （化學(xué)）劑
7 bent on 決心要做，一心想做（通常指壞事）
8 appeal 吸引力；感染力；魅力
注釋：2005年7月7日早上交通尖峰時間，4名受“基地”組織指使的英國人在倫敦三輛地鐵和一輛巴士上引爆自殺式炸彈，造成52名乘客遇難，700多人受傷。此次恐怖襲擊被稱為倫敦七七爆炸案。

聽力原文:

TATP can be detected with traditional technologies, like ion mobility spectrometry. This uses a desktop machine to analyse swabs. As the process can pick up minute traces of substances associated with explosives, it is hard to prevent at least a few molecules escaping onto someone’s hands and belongings. But even in airports, not every passenger is swabbed. Some machines sample air puffed onto passengers standing in cubicles, but it is a slow process. Dogs can pick out TATP, but handlers had been reluctant to train their animals to find the explosive because even tiny amounts can detonate. Now, though, trainers can use TATP as beads encased in a polymer that prevents detonation but also releases the odour.

重點詞匯：

1 ion 離子
2 spectrometry 光譜測定法，度譜術(shù); 譜測量;
3 ion mobility spectrometry 離子遷移率光譜測定法
4 swab （醫(yī)用的）拭子，藥簽
5 minute traces 微小的足跡， 蛛絲馬跡
6 substance 物質(zhì)；物品；東西
7 molecule 分子
8 puff吹；噴；吐
9 sample 抽樣檢驗；取樣；采樣
10 cubicle （大房間分隔出的）小房間，隔間
11 handler 馴獸員；（尤指）馴犬員
12 detonate（使）爆炸；引爆；起爆
13 bead 珠子；小珠
14 encase 把…裝箱（或圍住、包起）
15 polymer polymer 聚合物；多聚體
16 odour 氣味

聽力原文:

Such developments help, but airport-style security would be expensive and highly disruptive if these measures were imposed at all the entry points to crowded public places. Far better would be a system that can automatically analyse air samples and raise an alarm if any dangerous compounds are detected. That idea had seemed fanciful, but Kenneth Suslick at the University of Illinois at Urbana-Champaign thinks he has found a way to do it.

重點詞匯：

1 fanciful 空想的；想象的
2 Illinois 伊利諾斯州

聽力原文:

Dr Suslick’s strategy is to hunt for TATP using chemical dyes which can readily bind to reactive airborne compounds, changing colour when they do so. By using differently coloured dyes that each have an affinity for molecules of a specific compound released into the air by different explosives, the system would generate a unique colour signature when a dangerous material was nearby. Dr Suslick thinks that adding sensors onto a small cartridge-type device containing an array of different dyes would improve the system further by measuring other characteristics of airborne particles, such as their acidity and molecular polarity (the way they conduct a charge). It appears to be a complex bit of kit, but Dr Suslick is quick to point out that the method is really not much different to a multidimensional form of litmus paper.

重點詞匯：

1 dye 染料；染液
2 readily 快捷地；輕而易舉地；便利地
3 bind （使）聯(lián)合在一起，結(jié)合
4 airborne 空氣傳播的
5 reactive 能起化學(xué)反應(yīng)的；易反應(yīng)的
6 compound 化合物
7 affinity 密切的關(guān)系；類同
8 cartridge 膠片盒；暗盒；墨盒
9 array 大堆；大群；大量
10 particle顆粒；微粒
11 acidity 酸味；酸性
12 polarity 極性（兩極并存的狀態(tài)）
13 molecular polarity 分子極性
14 multidimensional 多面的，多維的

歡迎關(guān)注荔枝主播鳳梨君 FM1098550

歡迎關(guān)注主播鳳梨君 微信號fenglisama