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Grammar Girl here. Today I'm going to talk about on accident versus by accident and how language changes. Some of the most difficult questions I get are from non-native English speakers who want to know why we use a particular preposition in a specif
英语语法 Grammar Girl
1998年，飞行器设计师Paul MacCready面对一个人类全面统治自然的星球，讨论我们可以做些什么来维持自然的平衡。他的贡献：太阳能飞机，超高效滑翔机和电动汽车。
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By Lisa Schlein Geneva 28 March 2007 Human Rights activists from Burma are appealing to the U.N. Human Rights Council and the international community to maintain pressure on the government's military rulers to end their repression of the country's Ka
2007年VOA标准英语（三月）
U.S. President Barack Obama is back in campaign mode - traveling to regions hard-hit by the economic recession to rally support for his massive stimulus plan. His first stop was in a town in American's heartland with one of the highest unemployment
VOA标准英语2009年(二月)
U.S. President Barack Obama is stepping up his campaign for passage of the massive economic stimulus plan now making its way through Congress. Mr. Obama is taking to the road and the airwaves. President Obama delivers his weekly address, 07 Feb 2009
VOA标准英语2009年(二月)