It shall be unlawful for any person to deface, injure, knock down or remove any official traffic sign placed or erected as provided in this chapter.

任何损坏外观，破坏，打倒或删除按照本章要求放置的任何官方的交通信号都属于非法行为。

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In contrast, a single monitor operated by the United States Embassy in downtown Beijing, where traffic is heavy, consistently reports less healthy air conditions than the official index.

与此相反，位于北京高郊的美国驻华大使馆依其自已的一套监测设备则持续显示，有利有身体健康的空气质量状况统计数据要差于官方数据。

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Meanwhile, Hank Krakowski, the FAA official in charge of operating the air traffic control system, resigned Thursday.

同时，联邦航空部负责飞行交通控制系统的Hank Krakowski在周四辞职。

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No, said Melvin S. Davis, top NextGen official at the National Air Traffic Controllers Association union.

CNN: Can technology fix the FAA's air traffic troubles?

The accident happened in an area which is not under air traffic control, a FAA official who did not want to be identified discussing the details of the accident told CNN.

CNN: STORY HIGHLIGHTS

An official who heard tape recordings of the radio traffic from Flight 1549 reported the pilot was extraordinarily calm during the event.

CNN: Pilot praised for 'masterful' landing