| 1. | Nearly all our clothes are made from fibres of one sort or another , be they derived from plants , animals , coal or petroleum and all these fibres , when they are carefully examined , are seen to consist of long chain molecules
我们所有的衣服几乎都是由某种纤维制成的? ?不论这种纤维来源于动物、植物，还是来源于煤或石油；我们若仔细研究这些纤维，就会知道它们都是由长链分子组成的。 |
