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关注：1
2013-05-23 12:21
求翻译：signal lights (red, yellow and green ) are placed at many intersections to regulate the direction and flow of traffic.是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
signal lights (red, yellow and green ) are placed at many intersections to regulate the direction and flow of traffic.
问题补充： |
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