阅读部分需要提取的观点是:
- Main point: 氢燃料电池发动机将替代内燃机发动机
- Sub point 1:氢燃料来源丰富,不会用尽
- Sub point 2:氢燃料电池发动机不会污染环境
- Sub point 3:氢燃料电池发动机能量利用率高,更为经济
听力材料:
The reading is correct in pointing out the problems associated with oil-powered cars. Yes, oil is a finite resource, and yes, burning oil harms the environment. However, the reading is way too optimistic in its assessment of hydrogen-based fuel-cell engines. Hydrogen is not the solution to these problems.
阅读部分对于石油动力车的问题描述是站得住脚的。是的,石油是不可再生资源;是的,使用石油会造成环境污染。然而,阅读部分对于氢燃料电池内燃机的评论却过于乐观。氢燃料并不能解决这些问题。
First, hydrogen is not as easily available as the passage indicates. Although its present in common substances like water, its not directly useable in that form. For using a fuel-cell engine, hydrogen must first be obtained in a pure liquid state. This pure liquid hydrogen is a highly artificial substance. Its technologically very difficult to produce and store liquid hydrogen. For example, it must be kept very very cold at minus 253 degrees Celsius. Imagine the elaborate cooling technology thats required for that! So, hydrogen is not such a practical and easily available substance, is it?
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