单词：top-holest
单词：top-holest 相关文章
黑洞是一种引力极强的天体，就连光也不能逃脱。当恒星的史瓦西半径小到一定程度时，就连垂直表面发射的光都无法逃逸了。这时恒星就变成了黑洞。说它黑，是指它就像宇宙中的无底洞，
英语听力文摘 English Digest
A Boy, A Dog, A Frog and A Friend by Mercer and Marianna Mayer 1 One day a boy went fishing with his dog and his frog.He sat by the side of a pond and patiently waited for a fish to bite. 2 All of a sudden he felt a bite! 3 It had to be a big fish be
英语听力文摘 English Digest
There was once a farmer who lived near a road. It was not a busy road, but from time to time, cars passed the farm. Near the farm gate, there was a large hole in the road. This hole was always full of water, and the drivers of the cars could not see
趣味英语
The Lowest Note in the Universe 宇宙中的最低音 It's coming from a black hole in the Perseus Cluster, about two hundred fifty million light years away. A black hole？And outer space？That makes sound? Whats happening out there is that interga
英语听力文摘 English Digest
A Deep Hole in the Pole AMANDA望远镜（新华社电讯稿用的是南极介子和高能中微子探测器阵列名字），被埋藏在南极冰块下1.5公里深处。路透社2001年3月21日报道，这台望远镜首次探测到中微子。中微
英语听力文摘 English Digest
Sugar bowls and hole 孔隙是岩土固体矿物颗粒间的空间。岩土中直径大于1毫米、重力水可于其中自由运动的孔隙，是大孔隙（macro-pore，large pore）。岩土中直径为0.01～1毫米、重力水和毛管水可存其
英语听力文摘 English Digest