176.As a popular saying goes, everything has two sides. Now the public are benefiting more and more from scientific and technological inventions.On the other hand, the progress of science and technology is bringing us a lot of trouble.People in many countries are suffering from public hazards.

　　常言道：事情總是一分為二的。如今人們從科技發(fā)明中得到越來越多的好處。另一方面，科技進(jìn)步也給我們帶來了許多麻煩�，F(xiàn)在許多國家 的人民飽受公害之苦。

　　177.Let''s take cars for example.They not only pollute the air in cities, but make them crowded.Furthermore, they are responsible for a lot of traffic accidents.The noise made by cars disturbs the residents living on both sides of streets all day and night.

　　就拿汽車為例。汽車不僅污染城市空氣，而且使城市擁擠不堪。此外，汽車造成許多交通事故。汽車所產(chǎn)生的噪音使居住在街道兩旁的居民日夜不得安寧。

　　178.It is generally believed that the chief reason for the increase in population in developed countries is not so much the rise in birth rates as the decline in death rates as a result of the improvement in medical care.

　　普遍認(rèn)為，在發(fā)達(dá)國家人口增長的主要原因與其說是出生率的上升，還不如說是由于醫(yī)療保健的改善使死亡率下降了。

　　179.There is no doubt that the increase in demand caused the rise in prices.

　　毫無疑問，需求的增長導(dǎo)致了價格的上漲。

　　180.Additional social stresses may also occur because of the population explosion or problems arising from mass migration movements-themselves made relatively easy nowadays by modern means of transport.

　　由于人口的猛增或大量人口流動（現(xiàn)代交通工具使這種流動相對容易）引發(fā)的種種問題也會對社會造成新的壓力。

　　181.With the opening and reform policy being carried out, thousands upon thousands of foreign visitors are crowding into our country.They are eager to see this old mysterious land with a splendid culture of more than 5，000years.

　　隨著改革開放政策的貫徹執(zhí)行，數(shù)以萬計的外國游人涌入中國。他們渴望參觀這個有著5000多年燦爛文化的神秘古國。

　　182.Tourism brings China a lot of benefits.First, it enables the Chinese people to know more about the outside world and promotes friendship and understanding.Second, it is financially beneficial to China, which needs more foreign currencies for its modernization program.

　　旅游業(yè)給中國帶來許多好處。首先，它使中國人了解外界，并有助于促進(jìn)友誼和理解。其次，在經(jīng)濟上也有利于我國，因為中國現(xiàn)代化建設(shè)需要大量的外匯。

　　183 Tourism, however, gives rise to a number of problems.For instance, it becomes a burden to inefficient transportation system.

　　旅游業(yè)也引起許多問題。例如，它增加了我國本來效率不高的運輸系統(tǒng)的負(fù)擔(dān)。

　　184.Besides, the living standard of the average Chinese is still not high enough to be able to afford the many different sorts of expensed during long distance travels.

　　此外，中國人民的生活水平還沒有高到足以使普通中國人有錢支付長途旅行的各種開支。

　　185.As for me, with the development of our national economy, all these problems will certainly be solved step by step.

　　至于我，我相信，隨著我國經(jīng)濟的發(fā)展，這些問題必將逐步解決。

　　186.A much better and brighter future awaits us.

　　我們期望有一個更加光明的未來。

　　187.When an opportunity comes, it brings a promise but never realizes it on its own.

　　每當(dāng)機遇降臨，伴之而來的是成功的希望，但是機遇不能自行實現(xiàn)成功。

　　188.If you want to achieve something or intend to fulfill one of your ambitions, you must work hard, make efforts and get prepared.Otherwise, you will take no advantage of opportunities when they come to visit you.

　　假如你要取得成就或要實現(xiàn)你的雄心壯志，你必須努力工作、艱苦奮斗、準(zhǔn)備好條件。否則，機遇來臨你卻無法利用。 　　189.The difference between a man who succeeds and one who does not lies only in the way each treats opportunities.The successful person always makes adequate preparations to meet opportunities as they duly arrive.The unsuccessful person, on the other hand, works little and just waits to see pass by.

　　成功者與失敗者的區(qū)別在于處理機遇的態(tài)度。成功者做好充分準(zhǔn)備迎接機遇的適時來臨。而失敗者工作懶散，眼看機遇悄然而過。