評(píng)論
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In many countries, people produce power from coal, but it is very dirty and causes acid rain.
在很多國(guó)家，人們都用煤發(fā)電，但是這污染很大，還會(huì)導(dǎo)致酸雨。
Some countries use nuclear energy to produce power.
有些國(guó)家利用核能來(lái)發(fā)電。
However, nuclear power can be very dangerous.
但是，核能非常危險(xiǎn)。
To solve the energy problem, people all over the world are looking for new ways to produce power.
為了解決能源問(wèn)題，全世界的人們都在尋找新辦法來(lái)發(fā)電。
China is one of the first countries in the world to use biogas technology.
中國(guó)是世界上最早使用沼氣技術(shù)的國(guó)家之一。
Farmers recycle straw, grass and animal waste to make biogas.
農(nóng)民們回收稻草、雜草和動(dòng)物糞便來(lái)產(chǎn)生沼氣。
This renewable energy is used in people's everyday lives.
人們?nèi)粘Ｉ钪忻刻於紩?huì)用到這種可再生能源。
Its key disadvantage is that the process requires a long time (up to 30 days) and the cost is high.
它最主要的缺陷就是整個(gè)過(guò)程需要很長(zhǎng)時(shí)間（長(zhǎng)達(dá)30天），而且花費(fèi)很多。
Electric vehicles were developed in the 1990s.
20世紀(jì)90年代出現(xiàn)了電動(dòng)車。
On April 11, 2010 a new kind of electric vehicle named "Yezi" was shown in the 2010 Shanghai World Expo.
2010年4月，一種名為Yezi的新型電動(dòng)車在2010上海世博會(huì)上展出。
It produces electricity from the sun, the wind and CO2.
它靠太陽(yáng)能、風(fēng)能和二氧化碳發(fā)電。
It can not only protect the environment but also save energy.
它不僅能保護(hù)環(huán)境，還能節(jié)省能源。
It's too small to hold many people, but larger models will be developed in the near future.
它體型較小，無(wú)法承載太多人，不過(guò)更大的車型很快就會(huì)開(kāi)發(fā)出來(lái)。
In China, the best-known maglev train is the German-built one in Shanghai.
在中國(guó)，最出名的磁懸浮列車是上海的一輛德國(guó)制造列車。
It takes people just 7 minutes to go the airport 30 km away.
只用7分鐘，人們就能到達(dá)30千米外的機(jī)場(chǎng)。
The train can reach a top speed of 431 km per hour. It is quiet and quick.
這輛列車最快的速度能達(dá)到431千米每小時(shí)。它又安靜速度又快。
There is no wheel noise, because there are no wheels.
沒(méi)有車輪噪音，因?yàn)楦揪蜎](méi)有車輪。
Maglev trains are very energy efficient and do not pollute the air.
磁懸浮列車非常節(jié)能，而且不會(huì)污染空氣。
However, maglev guide paths are much more expensive than traditional steel railways.
但是，磁懸浮列車比傳統(tǒng)鐵軌昂貴許多。
