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51. | a supplementary angle [arc] |
| 补角 [补弧] |
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52. | excitation arc reactor |
| 励弧电抗器 |
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53. | lunula unguis |
| 指甲弧影 |
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54. | wet arcing length |
| 湿弧距离 |
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55. | back-arc basin |
| 弧后盆地 |
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56. | proper subarc |
| 真子弧 |
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57. | The archer holds the bow in his bow arm. |
| 运动员用执弓臂握住弓。 |
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58. | excessive sheer |
| 过大舷弧 |
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59. | FENDER TRIM |
| 汽车轮弧 |
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60. | element of arc length |
| 弧长元素 |
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