Supermassive Black Holes 超大质量黑洞 - 8

In every galaxy scientists looked at, they found evidence for a supermassive black hole. NGC 3115 NGC 3377 NGC 3379 In M31 and M32 In total there is probably 20-30 or so black holes that have been fou

发表于:2018-12-07 / 阅读(320) / 评论(0)

超大质量黑洞

Supermassive Black Holes 超大质量黑洞 - 5

By measuring how fast these stars were moving, he could prove if there really was a black hole at the center of an active galaxy. I picked a galaxy nearby which is called NGC 1068, an active galaxy, w

发表于:2018-12-07 / 阅读(330) / 评论(0)

超大质量黑洞

简单慢速英语阅读:Golf Lessons

Tim called Howard. Tim needed help. He needed help with his golf swing. He had a bad golf swing. He was a bad golfer. Howard had a good golf swing. He was a good golfer. Will you help me improve my golf swing? Tim asked. Yes, Ill help you improve you

发表于:2019-01-02 / 阅读(38) / 评论(0)

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Paul Pholeros:要减贫先修房

1985年, 一名提供医疗卫生服务的土著领导人启发了建筑师保尔蓬乐若思（Paul Pholeros），在澳大利亚南部的一个土著小社区内，开展了一个不再有人生病的项目计划。关键的理念是：不光要考虑

发表于:2019-01-05 / 阅读(74) / 评论(0)

TED公开课:贫穷至进步

2007年VOA标准英语-US Supreme Court Upholds Ban on Abortion Proced

By Meredith Buel Washington 18 April 2007 A closely divided U.S. Supreme Court has upheld a ban on a controversial abortion procedure. VOA correspondent Meredith Buel has details from Washington. Pro-abortion demonstrators in front of the US Supreme

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2006年VOA标准英语-Senate Report Rules Out al-Qaida Link with Sadd

By Dan Robinson Capitol Hill 08 September 2006 A report by a Senate committee says there is no evidence former Iraqi dictator Saddam Hussein had any relationship with the al-Qaida terrorist leader Abu Musab al-Zarqawi or his associates before the U.

发表于:2019-01-31 / 阅读(104) / 评论(0)

2006年VOA标准英语（九月）

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