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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
超大质量黑洞
今天分享的是swallow的用法。 重点词汇 Swallow vt. vi.吞，咽;忍耐，忍受 n.(鸟)燕子;胃管，食道; a bitter pill to swallow (必须吞下去的）苦药丸，不能不做的苦事，不得不忍受的屈辱 You're too old to b
卡卡课堂早餐英语
This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? February 28th is International Sword Swallowers Awareness Day, according to practitioner Dan Meyer, who recently demonstrated the technique at the AAAS meeting in Chic
Scientific American(二)月
[00:00.52] 12.18 Holes in His Mind [00:06.29]Major James Nesmeth had a dream of improving his golf game and he developed a unique method of achieving his goal. [00:14.35]Until he devised this method, he was just your average weekend golfer, shooting
温馨夜读II
New Data Adds to Understanding of 'Black Holes' WASHINGTON Scientists continue to learn more about black holes in space, places where the pull of gravity is so strong that not even light can escape. Black holes occur after supergiant stars explode in
VOA标准英语2016年(九月)
It happened that a country man was sowing some hemp seeds in a field where a Swallow and some other Birds were hopping about picking up their food. Be ware of that man,said the Swallow. Why, what is he doing? said the others. Those are hemp seeds he
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