| 1. | The chemical destroys botulinus .
该化学物质能消灭肉毒杆菌。 |
| 2. | These chemicals are difficult to remove from water .
要从水中清除这些化学物质是困难的。 |
| 3. | Chemical constantly circulate or recycle in the system .
化学物质在系统中不断循环或回流。 |
| 4. | The chemicals are not distributed evenly through-out the brain .
这些化学物质在脑内并不是均匀分布的。 |
| 5. | This chemical assists in construction of muscle, bone and other tissues .
这种化学物质有助于建造肌肉、骨骼和其它组织。 |
| 6. | Such chemicals taken up by plants can be harmful to humans and animals .
这种化学物质被植物吸收上来，就可能对人畜产生危害。 |
| 7. | Human exposure to various chemicals has been the subject of much speculation .
人类所置身其中的各种化学物质已成为思考的对象。 |
| 8. | Some industrial chemicals and food additives are known to be cancer-producing .
已知有些工业上的化学物质和食物附加物是致癌的。 |
| 9. | Many chemical substances are now applied to affect the growth of flowering plants .
现在应用很多化学物质来影响显花植物的生长。 |
| 10. | The chemical will only form if it can be distilled out of the mixture .
只有当它能够从混合物里蒸馏出来时，该化学物质才能形成。 |
