| 31. | enter upon the second phase of the research |
| 开始第二阶段的研究
|
| 32. | examine every phase of the problem |
| 检查问题的每一方面
|
| 33. | open a new phase |
| 开创一个新阶段
|
| 34. | the closing [opening] phase |
| 结束[开始]阶段
|
| 35. | the color phase |
| （禽类）季节性的羽毛变色
|
| 36. | a combat phase |
| （军）战斗阶段
|
| 37. | the critical phase of an illness |
| 疾病的危险期
|
| 38. | a dangerous phase in the relations between the two nations |
| 两国关系的危险阶段
|
| 39. | an essential phase of the problem |
| 这问题的一个重要方面
|
| 40. | this final phase of the campaign |
| 战役的最后阶段
|