| 21. | An increasing number of experts believe that migrants will exert positive effects on construction of city. However, this opinion is now being questioned by more and more city residents, who complain that the migrants have brought many serious problems like crime and prostitution. |
| 越来越多的专家相信移民对城市的建设起到积极作用。然而，越来越多的城市居民却怀疑这种说法，他们抱怨民工给城市带来了许多严重的问题，像犯罪和**。
|
| 22. | The whole atom is no more positive than it is negative. |
| 整个原子既不带正电，也不带负电。
|
| 23. | He seems to have a positive genius for.... |
| 他似乎确有…的天才。
|
| 24. | The number of positive numbers is infinite. |
| 正数的数目是无穷的。
|
| 25. | The test turned out to be positive . |
| 化验结果呈阳性。
|
| 26. | positive instructions, orders, rules, etc |
| 明确的指示, 命令, 规定等
|
| 27. | make positive proposals, suggestions, etc |
| 提出有益的建议, 意见等
|
| 28. | a positive attitude, feeling, etc |
| 乐观的态度, 情绪等
|
| 29. | a positive reaction |
| 阳性反应
|
| 30. | a positive number |
| 正数
|