英语二复习精要UNIT 2(2)

　　2、常考句型
　　1、天文学家和科学家认为黑洞是一种空间区，物质可以掉进黑洞但任何物质不能逃脱。P1
　　Astronomers and scientists think that a black hole is a region of space into which matter has fallen and from which nothing can escape.

　　2、理论上是这样的：当某些星体的密度增大到某一特定点时便发生爆炸。P2
　　The theory is that some stars explode when their density increases to a particular point.

　　3、有人认为圣诞星可能是一颗超新星。P2
　　Some people think that the Start of Bethlehem could have been a supernova.

　　4、假定一个人掉进黑洞，他会认为很快就能到达黑洞中心。P3
　　If a man fell into a black hole, he would think that he reached the center of it very quickly.

　　5、只是在近几年天文学家才开始具体研究黑洞。P3
　　It is only recently that astronomers have begun specific research into black holes.

　　6、另一方面，科学家们也在设想，由于有非常先进的技术，人们也许能在将来利用黑洞为人类服务。P5
　　On the other hand, scientists have suggested that every advanced technology could one day make use of the energy of black holes for mankind.