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51. | alternating activity |
| 交替活动 |
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52. | Day alternates with night. |
| 昼夜交替。 |
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53. | heteromorphic alternation |
| 异性交替 |
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54. | alternating dominance |
| 交替显性 |
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55. | pulsus alternans |
| 交替脉 |
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56. | alternate track |
| 交替磁道 |
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57. | alternant orbital |
| 交替轨道 |
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58. | alternating curing |
| 交替养护 |
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59. | alternate source |
| 交替源 |
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60. | alternating injection |
| 交替注入 |
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