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51. | Cross-cultural communication |
| 跨文化交流 |
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52. | alternating supercurrent |
| 超导交流 |
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53. | alternating-current servomechanism |
| 交流伺服机构 |
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54. | AC electric machine |
| 交流电机 |
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55. | alternating-current supervision |
| 交流控制 |
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56. | alternating current (a.c.) |
| 交流电流 |
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57. | ACSP (AC Spark Plug) |
| 交流火花塞 |
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58. | ac distribution |
| 交流配电 |
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59. | first hand exchange |
| 直接交流 |
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60. | AC electroluminescence |
| 交流电致发光 |
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