| 21. | world economics |
| 世界经济
|
| 22. | take up course in economics |
| （开始）上经济学课
|
| 23. | economics of scale |
| 规模经济学
|
| 24. | economics of commerce |
| 商业经济学
|
| 25. | economics of management |
| 管理经济学
|
| 26. | an expert in bridge [ economics , electronics] |
| 桥牌（经济学、电子学）专家
|
| 27. | lectures on economics [the situation] |
| 经济学[形势]讲座
|
| 28. | an economics professor |
| 经济学教授
|
| 29. | the communist concept of economics |
| 共产主义经济学概念
|
| 30. | speculate about the possibility of a deeper slump in the economics |
| 推测经济进一步萧条的可能性
|