202 Useful Exercises for IELTS Side1-24-Ex3.8Dictation1

       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 filthy¹ 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 components² 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.

1 filthy   

adj.卑劣的；恶劣的，肮脏的

参考例句：

• 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。

2 components   

（机器、设备等的）构成要素，零件，成分； 成分( component的名词复数 )； [物理化学]组分； [数学]分量； （混合物的）组成部分

参考例句：

• 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。