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5. As a popular saying goes "Everything has two sides."
(分析利弊)常言道：“事物总是一分为二的”。如今人们从科技发明中得到越来越多的好处。另一方面，科技进步也给我们带来了许多麻烦。现在许多国家的人民饱尝公害之苦。
As a popular saying goes, "Everything has two sides." Now people (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 srffering from public hazards.
6. For example, ...（举例阐述）For instance, ...Let's take ...for examlpe.
就拿汽车为例。汽车不仅污染城市空气，而且使城市拥挤不堪。此外，汽车造成许多交通事故。汽车所产生的噪音使居住在街道两旁的居民日夜不得安宁。
Let's take cars for example.They not only pollute the air in cities,but make them crowed.Furthermore,they carse a lot of traffic accidents. (..., 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.
