In parts of America, these clean power sources are finally cheaper than dirtier, conventional power.

在美国的部分地区，这些清洁能源总体上比原有的污染能源便宜。

Transgenic canola is growing freely in parts of North Dakota, researchers told the Ecological Society of America conference in Pittsburgh, Pennsylvania, today.

今天，在匹兹堡举行的美国生态学会年会上，有研究者报告称转基因甘蓝型油菜在北达科他州部分地区随意生长。