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51. | Make sure you fill up with gas at the gas station in Miami, |
| 在迈阿密的加油站(gas station)时务必说把油加满(fill up with gas), |
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-- 来源 -- 高级阅读(二) - Unit 24 Coffee or Tea Break? |
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52. | back-up bearing |
| 支承轴承 |
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53. | archival back-up |
| 归档备份 |
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54. | back-up satellite |
| 后援接替卫星; 备用卫星 |
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55. | back up oscillator |
| 后备振荡器 |
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56. | digital back-up |
| 数字备用设备 |
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57. | back up information |
| 后备信息 |
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58. | "Back up, son ! " |
| 振作起来,孩子! |
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59. | back-up surveillance |
| 辅助监督 |
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60. | analogue back-up |
| 模拟备份 |
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