他还想建造一条从波特兰市出发，横穿加拿大、美国，一直延伸到太平洋的绿化地带。
He also wants to build a green belt from Portland, across Canada and the United States, all the way back to the Pacific Ocean.
如果世界控制炭的排放量，美国一定不能只把自家行为打扫干净，也要帮助中国绿化其经济增长。
If the world is to contain its carbon emissions, America must not only clean up its own act but also help China to green its economic growth.
美国林务局研究员做的两项最新研究仔细调查了费城、巴尔的摩和俄亥俄州扬斯敦的市区绿化情况。
Two new studies, led by US Forest Service researchers, took a closer look at urban green space in Philadelphia, Baltimore and Youngstown, Ohio.
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