| 11. | We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders. |
| 我们要十分感谢那些吃昆虫的鸟和兽，然而把它们所杀死的昆虫全部加在一起也只相当于蜘蛛所消灭的一小部分。
|
| 12. | But even in the most favourable circumstances only a small fraction of the creatures that die are preserved in this way before decay sets in or, even more likely, before scavengers eat them. |
| 即使是在最有利的环境中，死去的生物中也只有一小部分能在开始腐烂前，或更可能在被食腐动物吃掉之前，被这样保存下来。
|
| 13. | Open the window a fraction [crack, bit], please. |
| 请将窗子打开一点点。
|
| 14. | precision instruments which can gauge the diameter to a fraction of a millimetre |
| 可测出直径几分之一毫米的精密仪器
|
| 15. | reduction of a fraction |
| （数）约分
|
| 16. | contain a fraction of truth |
| 有一点儿真实性
|
| 17. | a common [vulgar] fraction |
| 普通分数
|
| 18. | a complex [compound] fraction |
| 繁分数
|
| 19. | a decimal fraction |
| 小数
|
| 20. | a mixed fraction |
| 带分数
|