托福聽力:能量?燃料?小宇宙?查克拉?
來源:滬江聽寫酷
2011-10-29 12:00
Today I want to discuss fossil fuels such as coal, oil and natural gas. The term "fossil fuel" refers to the trapped remains of plants and animals in sedimentary rock. You see, living plants trap energy from the sun by the process of photosynthesis, and they store the energy in their chemical compounds. Most of that energy is released when the plant dies and decays. However, sometimes organic matter is buried before it decays completely. In this way some of the solar energy becomes trapped in rocks - hence the name "fossil fuel". Although the amount of organic matter trapped in any one growing season is small, the accumulated remains from millions of years are considerable. Because the accumulation rate is so slow - millions of times slower than the rate at which we now dig up this organic matter and burn it for energy. We must consider fossil fuels as nonrenewable resources. Tomorrow we'll be discussing alternatives to fossil fuels that can be renewed.
今天我想談論化石燃料,例如煤,石油和天然氣?!盎剂稀边@個詞指在沉積巖里動物和植物的遺體。你知道,生物通過光合作用存儲太陽能。他們存儲能量于化合物中。大多數(shù)能量在生物死亡和腐爛時流失。然而有時候在有機物完全腐爛之前就被埋于地下。就這樣一部分太陽能就存儲于巖石中,因此叫“化石燃料”。雖然有機物每一年都只能積累少量,但幾百萬年之后這個數(shù)字就很可觀了。因為積累的速率非常慢,所以就算有百萬年的時間也比不上我們現(xiàn)在挖出那些有機物然后燒了他們當能量的速率快。我們必須認識到化石燃料是不可再生能源。今后我們可能會探討恢復化石燃料的可選方案。 ——譯文來自: 蝸牛ke