英語二復(fù)習(xí)精要UNIT 2(2)

　　2、?？季湫?BR>　　1、天文學(xué)家和科學(xué)家認(rèn)為黑洞是一種空間區(qū)，物質(zhì)可以掉進黑洞但任何物質(zhì)不能逃脫。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、理論上是這樣的：當(dāng)某些星體的密度增大到某一特定點時便發(fā)生爆炸。P2
　　The theory is that some stars explode when their density increases to a particular point.

　　3、有人認(rèn)為圣誕星可能是一顆超新星。P2
　　Some people think that the Start of Bethlehem could have been a supernova.

　　4、假定一個人掉進黑洞，他會認(rèn)為很快就能到達黑洞中心。P3
　　If a man fell into a black hole, he would think that he reached the center of it very quickly.

　　5、只是在近幾年天文學(xué)家才開始具體研究黑洞。P3
　　It is only recently that astronomers have begun specific research into black holes.

　　6、另一方面，科學(xué)家們也在設(shè)想，由于有非常先進的技術(shù)，人們也許能在將來利用黑洞為人類服務(wù)。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.