Police prepare to seal off in boxes the captured ephedrine in Buenos Aires, capital of Argentina, August 24, 2009.[Martin Zabala/Xinhua]
![Police prepare to seal off in boxes the captured ephedrine in Buenos Aires, capital of Argentina, August 24, 2009.[Martin Zabala/Xinhua]](http://images.china.cn/attachement/jpg/site1007/20090825/000bcdb95f1d0bfd8a9815.jpg "Police prepare to seal off in boxes the captured ephedrine in Buenos Aires, capital of Argentina, August 24, 2009.[Martin Zabala/Xinhua]")