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| 41. | improvement research |
| 改进研究 |
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| 42. | Try and improve. |
| 尽量改进. |
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| 43. | engineering improvement |
| 工程改进 |
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| 44. | quest for improvement |
| 寻求改进 |
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| 45. | erational development |
| 运行改进 |
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| 46. | improvement curve |
| 改进曲线 |
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| 47. | environmental impro vement |
| 环境改进 |
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| 48. | improving audit |
| 改进审计工作 |
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| 49. | locality inprovement |
| 局部改进 |
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| 50. | convergent improvement |
| 复合改进 |
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