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51. | periodic observation |
| 定期观测 |
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52. | a fixed deposit |
| 定期储蓄 |
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53. | scheduled airline |
| 定期航线 |
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54. | periodic report |
| 定期报告 |
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55. | regular bulletin |
| 定期公报 |
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56. | periodic measurement |
| 定期测量 |
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57. | recruit on a regular basis |
| 定期招募 |
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58. | periodic planning |
| 定期计划编制 |
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59. | periodic audit report |
| 定期审计报告 |
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60. | periodic review |
| 定期审查 |
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