④ operate
　　vi. 1、運(yùn)轉(zhuǎn)，起作用；2、動(dòng)手術(shù)（on,upon）
　　The elevator operates smoothly.
　　電梯運(yùn)行順利。
　　The medicine gradually operated.
　　藥物逐漸奏效了。
　　The doctor operated on the neck of the patient.
　　醫(yī)生給病人的頸部動(dòng)手術(shù)。
　　vt.1、操作，操縱，經(jīng)營(yíng)；2、對(duì)。。。動(dòng)手術(shù)
　　This airline operates five main lines and dozens of branch lines.
　　這家航空公司經(jīng)營(yíng)五條主干線和十幾條支線。
　　Do you know how to operate the machine?
　　你知道怎么開(kāi)這臺(tái)機(jī)器嗎？
　　The doctor operated the patient on the neck.
　　醫(yī)生給病人的頸部動(dòng)手術(shù)。
　　He was operated on for lung cancer.
　　他因肺癌動(dòng)了手術(shù)。
　　二、常考句型
　　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(jìn)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(diǎn)時(shí)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(gè)人掉進(jìn)黑洞，他會(huì)認(rèn)為很快就能到達(dá)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(kāi)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(jìn)的技術(shù)，人們也許能在將來(lái)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.
　　三、習(xí)題
　　Unit 2 練習(xí)：
　　1.詞匯英譯漢：
　　escape, explode, collapse, shrink, gravity, measurement, basis, launch, convincing, companion,
　　speculation, swallow, operate, to make use of, a great many, above all
　　2.句子英譯漢：
　　1) ~6) 與�？季湫拖嗤�。
　　7) There might be a massive black hole at the center of our galaxy swallowing up stars at a very rapid rate.
　　8) They show us a world which operates in a totally different way from our own and they question our most basic experience of space and time.