Once a rarity, traffic cameras are filming away across the country. And they're not just focusing their sights on red-light runners. The latest technology includes cameras that keep tabs on highways to catch speeders in the act and infrared license-plate readers that nab ticket and tax scofflaws.
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Once a rarity, traffic cameras are filming away across the country.
一旦有了先例，现在在整个村庄都安装了交通摄像头。
Overweight people were once a rarity in Japan. Fast food restaurants arrived there thirty years ago, and today one-third of all Japanese men in their thirties are overweight.
以前日本国内超体重的人很少，快餐业在三十年前进入了日本后，如今有三分之一的三十几岁的日本男子超重了。
Once a rarity for black children, ballet classes are now a treat three times a week in Johannesburg's Alexandra township, thanks to an outreach program of the South African ballet Theatre.
感谢南非芭蕾剧院的拓展计划，如今在约翰内斯堡亚历山德拉镇，黑人孩子每周能上三次芭蕾课，而以前他们难得看到芭蕾舞。
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