202 Useful Exercises for IELTS Side1-24-Ex3.8Dictation1
时间：2018-12-30 作者：英语课 分类：202 Useful Exercises for IELTS
Narrator: Exercise 3.8. Dictation 1:
Air pollution / is probably the modern world's greatest threat. / Water can be filtered, / land can be cleared, / but filthy 1 air can only be filtered / by the nose and lungs. / It is estimated / that living in a big city / is equivalentto smoking / half a packet of cigarettes a day. / What is more, / the most dangerous components 2 of air pollution/ are invisible gases. / We cannot smell or see / the dangerous gases given off / from the exhausts / of cars, lorriesand buses. / However, / this does not mean / they are not present in our bloodstream / every time we take a breath.
/ It is obvious / that our future health / depends on the development / of a safer vehicle engine.
- The whole river has been fouled up with filthy waste from factories.整条河都被工厂的污秽废物污染了。
- You really should throw out that filthy old sofa and get a new one.你真的应该扔掉那张肮脏的旧沙发，然后再去买张新的。
- the components of a machine 机器部件
- Our chemistry teacher often reduces a compound to its components in lab. 在实验室中化学老师常把化合物分解为各种成分。