Using hidden cameras and cheap bicycles as bait, an Argentine publicist set out to gauge crime in different neighbourhoods of Buenos Aires.

• 一位阿根廷的广告业人士用隐蔽的摄影机，还有廉价的自行车作诱饵，着手监测布宜诺斯艾利斯不同居住区的犯罪程度。