Ian Smith, a Ph.D. student of Boston University in the United States, said, "Cities are in the important position in fighting against rising temperatures and increasing CO2."

美国波士顿大学的博士生伊恩·史密斯说：“城市在对抗气温上升和二氧化碳增加方面处于重要地位。”

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The United States currently has just one high-speed line — a 735-kilometer system serving Boston, New York City, and Washington, DC.

美国现在仅有一条高速铁路线——一条服务于波士顿、纽约和华盛顿特区之间的全长735公里的铁路系统。

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Foursquare is available in 31 cities in the United States, including New York, Chicago, San Francisco, Boston and Washington.

四方会目前在美国的31个城市提供服务，其中有纽约，芝加哥，旧金山，波士顿和华盛顿。

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He took charge in June 2004 but left in November 2005 to join the coaching staff at Boston United.

BBC: SPORT | Football | My Club | Clyde | Clyde closing in on new manager

Rusk, who has had spells with Boston United and York City, is happy to compete with the club's new signings.

BBC: More pressure on Crawley Town, says Simon Rusk

May God bless the people of Boston and the United States of America.

WHITEHOUSE: Weekly Address: America Stands with the City of Boston